feat(intel): enable SDMMC frontdoor load for ATF->Linux

SDMMC is 1 of the boot source for Agilex5 and legacy products.
By enabling this, ATF is able to read out the DTB binary and
loaded it to DDR for Linux boot.

Change-Id: Ida303fb43ea63013a08083ce65952c5ad4e28f93
Signed-off-by: Jit Loon Lim <jit.loon.lim@intel.com>
Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
diff --git a/plat/intel/soc/common/socfpga_storage.c b/plat/intel/soc/common/socfpga_storage.c
index e80f074..2d3d798 100644
--- a/plat/intel/soc/common/socfpga_storage.c
+++ b/plat/intel/soc/common/socfpga_storage.c
@@ -55,6 +55,12 @@
 	.uuid = UUID_NON_TRUSTED_FIRMWARE_BL33,
 };
 
+# if ARM_LINUX_KERNEL_AS_BL33 != 0
+static const io_uuid_spec_t nt_fw_config_uuid_spec = {
+	.uuid = UUID_NT_FW_CONFIG,
+};
+# endif
+
 uintptr_t a2_lba_offset;
 const char a2[] = {0xa2, 0x0};
 
@@ -101,6 +107,13 @@
 		(uintptr_t) &bl33_uuid_spec,
 		check_fip
 	},
+# if ARM_LINUX_KERNEL_AS_BL33 != 0
+	[NT_FW_CONFIG_ID] = {
+		&fip_dev_handle,
+		(uintptr_t)&nt_fw_config_uuid_spec,
+		check_fip
+	},
+# endif
 	[GPT_IMAGE_ID] = {
 		&boot_dev_handle,
 		(uintptr_t) &gpt_block_spec,