vboot: Add VBOOT_ARMV8_CE_SHA256_ACCELERATION config

Add Kconfig option for VBOOT_ARMV8_CE_SHA256_ACCELERATION, which will
use ARMv8 Crypto Extension for SHA256[1] instead of software
implementation.

This will speed up firmware verification in verstage.

[1] https://crrev.com/c/4170144

BUG=b:263514393
BRANCH=corsola
TEST='calculating body hash (SHA2)' get 13 msecs improvement on
Tentacruel.
Before:
 509:finished calculating body hash (SHA2)             161,548 (14,490)

After:
 509:finished calculating body hash (SHA2)             155,101 (1,187)

Change-Id: I02671338fd9e0deb5294dbb7c03528061edc18c4
Signed-off-by: Yidi Lin <yidilin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72711
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/security/vboot/Kconfig

@@ -291,6 +291,14 @@ config VBOOT_X86_SHA256_ACCELERATION
 	  Use sha256msg1, sha256msg2, sha256rnds2 instruction to accelerate
 	  SHA hash calculation in vboot.
 
+config VBOOT_ARMV8_CE_SHA256_ACCELERATION
+	bool "Use ARMv8 Crypto Extension for sha256 hash calculation"
+	default y if CHROMEOS
+	default n
+	depends on ARCH_ARM64
+	help
+	  Use ARMv8 Crypto Extension to accelerate SHA hash calculation in vboot.
+
 config VBOOT_DEFINE_WIDEVINE_COUNTERS
 	bool
 	default n

src/security/vboot/Makefile.inc

@@ -30,6 +30,7 @@ $$(VBOOT_LIB_$(1)): $(obj)/config.h
 	EC_EFS="$(CONFIG_VBOOT_EC_EFS)" \
 	X86_SHA_EXT="$(if $(CONFIG_ARCH_$(call toupper,$(1))_X86_32)$(CONFIG_ARCH_$(call toupper,$(1))_X86_64),$\
 			$(CONFIG_VBOOT_X86_SHA256_ACCELERATION))" \
+	ARMV8_CRYPTO_EXT="$(if $(CONFIG_ARCH_$(call toupper,$(1))_ARMV8_64),$$(CONFIG_VBOOT_ARMV8_CE_SHA256_ACCELERATION))" \
 	$(MAKE) -C $(VBOOT_SOURCE) \
 		BUILD=$$(abspath $$(dir $$(VBOOT_LIB_$(1)))) \
 		V=$(V) \