bios_emulator: Add Kconfig and adjust Makefile for SPL

The Kconfig for this is currently inside a particular board. Move it into
the correct place and allow use in SPL, so that video can be used there
if needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

board/google/Kconfig

@@ -4,13 +4,6 @@
 
 if VENDOR_GOOGLE
 
-config BIOSEMU
-	bool
-	select X86EMU_RAW_IO
-
-config X86EMU_RAW_IO
-	bool
-
 choice
 	prompt "Mainboard model"
 	optional

drivers/Kconfig

@@ -10,6 +10,8 @@ source "drivers/ata/Kconfig"
 
 source "drivers/axi/Kconfig"
 
+source "drivers/bios_emulator/Kconfig"
+
 source "drivers/bus/Kconfig"
 
 source "drivers/block/Kconfig"

drivers/Makefile

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0+
 
+obj-$(CONFIG_$(SPL_TPL_)BIOSEMU) += bios_emulator/
 obj-$(CONFIG_$(SPL_TPL_)BLK) += block/
 obj-$(CONFIG_$(SPL_TPL_)BOOTCOUNT_LIMIT) += bootcount/
 obj-$(CONFIG_$(SPL_TPL_)BUTTON) += button/
@@ -80,7 +81,6 @@ ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
 obj-y += adc/
 obj-y += ata/
 obj-$(CONFIG_DM_DEMO) += demo/
-obj-$(CONFIG_BIOSEMU) += bios_emulator/
 obj-y += block/
 obj-y += cache/
 obj-$(CONFIG_CPU) += cpu/

drivers/bios_emulator/Kconfig

@@ -0,0 +1,10 @@
+config BIOSEMU
+	bool
+	select X86EMU_RAW_IO
+
+config SPL_BIOSEMU
+	bool
+	select X86EMU_RAW_IO
+
+config X86EMU_RAW_IO
+	bool