kernel: crypto: add SHA512 ARM64 ASM optimized module

Kernel has an ASM optimized version of SHA512 that was ported from
OpenSSL, so lets package it as it provides significant perfomance
improvement compared to the generic implementation.

There is a Cryptographic Extension based version as well, but that relies
on ARMv8.2 ISA which I am not aware any of the OpenWrt supported SoC-s use.

Signed-off-by: Robert Marko <robimarko@gmail.com>

package/kernel/linux/modules/crypto.mk

@@ -1038,6 +1038,7 @@ define KernelPackage/crypto-sha512
   KCONFIG:= \
 	CONFIG_CRYPTO_SHA512 \
 	CONFIG_CRYPTO_SHA512_ARM \
+	CONFIG_CRYPTO_SHA512_ARM64 \
 	CONFIG_CRYPTO_SHA512_OCTEON \
 	CONFIG_CRYPTO_SHA512_SSSE3
   FILES:=$(LINUX_DIR)/crypto/sha512_generic.ko
@@ -1050,6 +1051,11 @@ define KernelPackage/crypto-sha512/arm
   AUTOLOAD+=$(call AutoLoad,09,sha512-arm)
 endef
 
+define KernelPackage/crypto-sha512/aarch64
+  FILES+=$(LINUX_DIR)/arch/arm64/crypto/sha512-arm64.ko
+  AUTOLOAD+=$(call AutoLoad,09,sha512-arm64)
+endef
+
 KernelPackage/crypto-sha512/imx=$(KernelPackage/crypto-sha512/arm)
 KernelPackage/crypto-sha512/ipq40xx=$(KernelPackage/crypto-sha512/arm)
 KernelPackage/crypto-sha512/mvebu/cortexa9=$(KernelPackage/crypto-sha512/arm)