docs(changelog): remove FEAT_XXXX scopes

We have one entry per CPU features but most of the time we just add
CPU feature and its not touched again, so considering to generalize
anything with FEAT_XXXX additions to use `cpufeat` as subsection scope.

Also, some time we don't add a scope for CPU feature this causes problem
while generating release notes as CPU feature additions ends up in wrong
section.

Change-Id: Ibc80f6cdab9ae10ec3af1485640f46771b382da0
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>

changelog.yaml

@@ -86,93 +86,41 @@ subsections:
   - title: Architecture
 
     subsections:
-      - title: Activity Monitors Extension (FEAT_AMU)
-        scope: amu
-
-      - title: Branch Record Buffer Extension (FEAT_BRBE)
-        scope: brbe
-
-      - title: Branch Target Identification Extension
-        scope: bti
-
-      - title: Confidential Compute Architecture (CCA)
-        scope: cca
-
-      - title: Extended Cache Index (FEAT_CCIDX)
-        scope: ccidx
-
-      - title: Extended Translation Control Register (FEAT_TCR2).
-        scope: tcr2
-
-      - title: Fine-grained Traps 2 (FEAT_FGT2).
-        scope: fgt2
-
-      - title: CPU feature / ID register handling in general
+      - title: CPU feature like FEAT_XXXX / ID register handling in general
         scope: cpufeat
 
-      - title: Debug Extension (FEAT_Debugv8p9)
-        scope: debugv8p9
-
-      - title: Guarded Control Stack (FEAT_GCS)
-        scope: gcs
-
-      - title: Support for the `HCRX_EL2` register (FEAT_HCX)
-        scope: hcx
-
-      - title: Memory Partitioning and Monitoring (MPAM) Extension (FEAT_MPAM)
-        scope: mpam
-
-      - title: Memory Tagging Extension2
-        scope: mte2
-
         deprecated:
+          - amu
+          - brbe
+          - bti
+          - cca
+          - ccidx
+          - d128
+          - debugv8p9
+          - fgt2
+          - gcs
+          - hcx
+          - mpam
           - mte
-
-      - title: Pointer Authentication Extension
-        scope: pauth
-
-      - title: Performance Monitors Extension (FEAT_PMUv3)
-        scope: pmu
-
-      - title: Trapping support for RNDR/RNDRRS (FEAT_RNG_TRAP)
-        scope: rng-trap
-
-      - title: Scalable Matrix Extension (FEAT_SME, FEAT_SME2)
-        scope: sme
-
-      - title: Statistical profiling Extension (FEAT_SPE)
-        scope: spe
-
-      - title: Scalable Vector Extension (FEAT_SVE)
-        scope: sve
-
-      - title: System Register Trace Extensions (FEAT_ETMv4, FEAT_ETE and FEAT_ETEv1.1)
-        scope: sys-reg-trace
-
-        deprecated:
+          - mte2
+          - pauth
+          - pmu
+          - rng-trap
+          - sctlr2
+          - feat_sctlr2
+          - sme
+          - spe
+          - sve
+          - sys-reg-trace
           - sys_reg_trace
-
-      - title: Trace Buffer Extension (FEAT_TRBE)
-        scope: trbe
-
-      - title: Self-hosted Trace Extensions (FEAT_TRF)
-        scope: trf
+          - tcr2
+          - trbe
+          - trf
+          - the
 
       - title: DynamIQ Shared Unit (DSU)
         scope: dsu
 
-      - title: Extension to SCTLR_ELx (FEAT_SCTLR2)
-        scope: sctlr2
-
-        deprecated:
-          - feat_sctlr2
-
-      - title: 128-bit Translation Tables (FEAT_D128)
-        scope: d128
-
-      - title: Translation Hardening Extension (FEAT_THE)
-        scope: the
-
   - title: Platforms
     scope: platforms