spl: nor: support loading i.MX container format file

i.MX8 only support AHAB secure boot with Container format image,
we could not use FIT to support secure boot, so introduce container
support to let SPL could load container images.

Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>
Cc: York Sun <york.sun@nxp.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Alex Kiernan <alex.kiernan@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Cc: Kever Yang <kever.yang@rock-chips.com>
Cc: Heiko Schocher <hs@denx.de>
Signed-off-by: NPeng Fan <peng.fan@nxp.com>

common/spl/spl_nor.c

@@ -6,7 +6,6 @@
 #include <common.h>
 #include <spl.h>
 
-#ifdef CONFIG_SPL_LOAD_FIT
 static ulong spl_nor_load_read(struct spl_load_info *load, ulong sector,
 			       ulong count, void *buf)
 {
@@ -16,7 +15,6 @@ static ulong spl_nor_load_read(struct spl_load_info *load, ulong sector,
 
 	return count;
 }
-#endif
 
 unsigned long __weak spl_nor_get_uboot_base(void)
 {
@@ -97,6 +95,13 @@ static int spl_nor_load_image(struct spl_image_info *spl_image,
 		return ret;
 	}
 #endif
+	if (IS_ENABLED(CONFIG_SPL_LOAD_IMX_CONTAINER)) {
+		load.bl_len = 1;
+		load.read = spl_nor_load_read;
+		return spl_load_imx_container(spl_image, &load,
+					      spl_nor_get_uboot_base());
+	}
+
 	ret = spl_parse_image_header(spl_image,
 			(const struct image_header *)spl_nor_get_uboot_base());
 	if (ret)