efi: clean up Kconfig dependencies on CONFIG_EFI

Geert reports that the new option CONFIG_EFI_DISABLE_RUNTIME is user
visible even when EFI support is disabled, which is unnecessary and
clutters the Kconfig interface.

So let's move this option into the existing Kconfig submenu that already
depends on CONFIG_EFI, and while at it, give some other options the same
treatment.

Also clean up a small wart where the efi/ subdirectory is listed twice.
Let's just list it unconditionally so that both EFI and UEFI_CPER based
pieces will be built independently (the latter only depends on the
former on !X86)
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

drivers/firmware/Makefile

@@ -31,8 +31,7 @@ obj-y				+= broadcom/
 obj-y				+= cirrus/
 obj-y				+= meson/
 obj-$(CONFIG_GOOGLE_FIRMWARE)	+= google/
-obj-$(CONFIG_EFI)		+= efi/
-obj-$(CONFIG_UEFI_CPER)		+= efi/
+obj-y				+= efi/
 obj-y				+= imx/
 obj-y				+= psci/
 obj-y				+= smccc/

drivers/firmware/efi/Kconfig

@@ -193,6 +193,9 @@ config EFI_TEST
 	  Say Y here to enable the runtime services support via /dev/efi_test.
 	  If unsure, say N.
 
+config EFI_DEV_PATH_PARSER
+	bool
+
 config APPLE_PROPERTIES
 	bool "Apple Device Properties"
 	depends on EFI_STUB && X86
@@ -255,40 +258,15 @@ config EFI_DISABLE_PCI_DMA
 	  options "efi=disable_early_pci_dma" or "efi=no_disable_early_pci_dma"
 	  may be used to override this option.
 
-endmenu
-
-config EFI_EMBEDDED_FIRMWARE
-	bool
-	depends on EFI
-	select CRYPTO_LIB_SHA256
-
-config UEFI_CPER
-	bool
-
-config UEFI_CPER_ARM
-	bool
-	depends on UEFI_CPER && ( ARM || ARM64 )
-	default y
-
-config UEFI_CPER_X86
-	bool
-	depends on UEFI_CPER && X86
-	default y
-
-config EFI_DEV_PATH_PARSER
-	bool
-	depends on ACPI
-	default n
-
 config EFI_EARLYCON
 	def_bool y
-	depends on EFI && SERIAL_EARLYCON && !ARM && !IA64
+	depends on SERIAL_EARLYCON && !ARM && !IA64
 	select FONT_SUPPORT
 	select ARCH_USE_MEMREMAP_PROT
 
 config EFI_CUSTOM_SSDT_OVERLAYS
 	bool "Load custom ACPI SSDT overlay from an EFI variable"
-	depends on EFI && ACPI
+	depends on ACPI
 	default ACPI_TABLE_UPGRADE
 	help
 	  Allow loading of an ACPI SSDT overlay from an EFI variable specified
@@ -314,7 +292,6 @@ config EFI_DISABLE_RUNTIME
 
 config EFI_COCO_SECRET
 	bool "EFI Confidential Computing Secret Area Support"
-	depends on EFI
 	help
 	  Confidential Computing platforms (such as AMD SEV) allow the
 	  Guest Owner to securely inject secrets during guest VM launch.
@@ -327,3 +304,22 @@ config EFI_COCO_SECRET
 	  for usage inside the kernel.  This will allow the
 	  virt/coco/efi_secret module to access the secrets, which in turn
 	  allows userspace programs to access the injected secrets.
+
+config EFI_EMBEDDED_FIRMWARE
+	bool
+	select CRYPTO_LIB_SHA256
+
+endmenu
+
+config UEFI_CPER
+	bool
+
+config UEFI_CPER_ARM
+	bool
+	depends on UEFI_CPER && ( ARM || ARM64 )
+	default y
+
+config UEFI_CPER_X86
+	bool
+	depends on UEFI_CPER && X86
+	default y