build(corstone1000): rename diphda to corstone1000

diphda platform is now being renamed to corstone1000.
These changes are to replace all the instances and traces
of diphda  corstone1000.

Change-Id: I330f3a112d232b99b4721b6bf0236253b068dbba
Signed-off-by: Arpita S.K <Arpita.S.K@arm.com>
Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>

docs/plat/arm/corstone1000/index.rst

@@ -1,7 +1,7 @@
-Diphda Platform
+Corstone1000 Platform
 ==========================
 
-Some of the features of the Diphda platform referenced in TF-A include:
+Some of the features of the Corstone1000 platform referenced in TF-A include:
 
 - Cortex-A35 application processor (64-bit mode)
 - Secure Enclave
@@ -37,7 +37,7 @@ Build Procedure (TF-A only)
       CC=aarch64-none-elf-gcc \
       V=1 \
       BUILD_BASE=<path to the build folder> \
-      PLAT=diphda \
+      PLAT=corstone1000 \
       SPD=spmd \
       SPMD_SPM_AT_SEL2=0 \
       DEBUG=1 \

docs/plat/arm/index.rst

@@ -13,7 +13,7 @@ Arm Development Platforms
    arm_fpga/index
    arm-build-options
    morello/index
-   diphda/index
+   corstone1000/index
 
 This chapter holds documentation related to Arm's development platforms,
 including both software models (FVPs) and hardware development boards