FP5: Update AVB configuration

Change-Id: Ifd21414d7aec81782f37ef4175c01d15406af5c0
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 596df35..20dbc36 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -169,9 +169,10 @@
 # Verified Boot
 BOARD_AVB_ENABLE := true
 BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS += --flags 3
+BOARD_AVB_ALGORITHM := SHA256_RSA4096
 BOARD_AVB_VBMETA_SYSTEM := system system_ext product
-BOARD_AVB_VBMETA_SYSTEM_ALGORITHM := SHA256_RSA2048
-BOARD_AVB_VBMETA_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
+BOARD_AVB_VBMETA_SYSTEM_ALGORITHM := SHA256_RSA4096
+BOARD_AVB_VBMETA_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa4096.pem
 BOARD_AVB_VBMETA_SYSTEM_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)
 BOARD_AVB_VBMETA_SYSTEM_ROLLBACK_INDEX_LOCATION := 2