sm8550-common: Enable system_dlkm partition to host GKI modules

- Enable compilation of system_dlkm image to package GKI modules.
  It provides the flexibility to update GKI driver post KMI freeze.

- Use sha256 to build hashtree for system_dlkm partition since it
  provides robustness against malicious attacks.

Change-Id: Icb3a5ab44d39f8b55324b7d8c47ea3c01f94f066

BoardConfigCommon.mk

@@ -16,6 +16,7 @@ AB_OTA_PARTITIONS += \
     product \
     recovery \
     system \
+    system_dlkm \
     system_ext \
     vbmeta \
     vbmeta_system \
@@ -71,7 +72,7 @@ BOARD_VENDOR_BOOTIMAGE_PARTITION_SIZE := 100663296
 
 BOARD_SUPER_PARTITION_SIZE := 12100567040
 BOARD_SUPER_PARTITION_GROUPS := samsung_dynamic_partitions
-BOARD_SAMSUNG_DYNAMIC_PARTITIONS_PARTITION_LIST := odm product system system_ext vendor vendor_dlkm
+BOARD_SAMSUNG_DYNAMIC_PARTITIONS_PARTITION_LIST := odm product system system_dlkm system_ext vendor vendor_dlkm
 BOARD_SAMSUNG_DYNAMIC_PARTITIONS_SIZE := 12096372736
 
 BOARD_FLASH_BLOCK_SIZE := 262144 # (BOARD_KERNEL_PAGESIZE * 64)
@@ -81,10 +82,12 @@ BOARD_PRODUCTIMAGE_FILE_SYSTEM_TYPE := ext4
 BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE := ext4
 BOARD_SYSTEM_EXTIMAGE_FILE_SYSTEM_TYPE := ext4
 BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE := ext4
+BOARD_SYSTEM_DLKMIMAGE_FILE_SYSTEM_TYPE := ext4
 BOARD_VENDOR_DLKMIMAGE_FILE_SYSTEM_TYPE := ext4
 
 TARGET_COPY_OUT_ODM := odm
 TARGET_COPY_OUT_PRODUCT := product
+TARGET_COPY_OUT_SYSTEM_DLKM := system_dlkm
 TARGET_COPY_OUT_SYSTEM_EXT := system_ext
 TARGET_COPY_OUT_VENDOR := vendor
 TARGET_COPY_OUT_VENDOR_DLKM := vendor_dlkm
@@ -114,3 +117,6 @@ BOARD_AVB_VBMETA_SYSTEM_ALGORITHM := SHA256_RSA2048
 BOARD_AVB_VBMETA_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
 BOARD_AVB_VBMETA_SYSTEM_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)
 BOARD_AVB_VBMETA_SYSTEM_ROLLBACK_INDEX_LOCATION := 2
+
+# Use sha256 hash algorithm for system_dlkm partition
+BOARD_AVB_SYSTEM_DLKM_ADD_HASHTREE_FOOTER_ARGS += --hash_algorithm sha256