arm64: remove duplicate ARCH_HAS_MEM_ENCRYPT

The commit e7bafbf ("arm64: mm: Add top-level dispatcher for
internal mem_encrypt API") adds ARCH_HAS_MEM_ENCRYPT. And then the
commit 42be24a ("arm64: Enable memory encrypt for Realms") adds
duplicate config. Just remove it.

Fixes: 42be24a ("arm64: Enable memory encrypt for Realms")
Signed-off-by: Cai Xinchen <caixinchen1@huawei.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Author: Caixinchen1

arch/arm64/Kconfig

@@ -47,7 +47,6 @@ config ARM64
 	select ARCH_HAS_SETUP_DMA_OPS
 	select ARCH_HAS_SET_DIRECT_MAP
 	select ARCH_HAS_SET_MEMORY
-	select ARCH_HAS_MEM_ENCRYPT
 	select ARCH_HAS_FORCE_DMA_UNENCRYPTED
 	select ARCH_STACKWALK
 	select ARCH_HAS_STRICT_KERNEL_RWX