Fix the issue with signed kernel compilation for ARM64 architecture (sonic-net#381)

CONFIG_KEXEC_SIG_FORCE is not available for ARM64 architecture. CONFIG_KEXEC_SIG should be used instead.

Signed-off-by: Oleksandr Ivantsiv <[email protected]>
Co-authored-by: Yakiv Huryk <[email protected]>

Author: oleksandrivantsiv

patch/kconfig-secure-boot-inclusions

@@ -11,7 +11,7 @@ CONFIG_MODULE_SIG_FORCE=y
 CONFIG_SYSTEM_TRUSTED_KEYS="debian/certs/debian-uefi-certs.pem"
 CONFIG_MODULE_SIG_HASH="sha512"
 CONFIG_MODULE_SIG_SHA512=y
-CONFIG_KEXEC_SIG_FORCE=y
+CONFIG_KEXEC_SIG=y
 CONFIG_MODULE_SIG_FORCE=y
 
 [armhf]