spl: mmc: introduce spl_mmc_get_uboot_raw_sector

Introduce a weak function spl_mmc_get_uboot_raw_sector, then platform
could have their own implementation.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Andreas Dannenberg <dannenberg@ti.com>
Cc: Alex Kiernan <alex.kiernan@gmail.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Michal Simek <michal.simek@xilinx.com>

common/spl/spl_mmc.c

@@ -313,6 +313,15 @@ int spl_boot_partition(const u32 boot_device)
 }
 #endif
 
+unsigned long __weak spl_mmc_get_uboot_raw_sector(struct mmc *mmc)
+{
+#ifdef CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR
+	return CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR;
+#else
+	return 0;
+#endif
+}
+
 int spl_mmc_load(struct spl_image_info *spl_image,
 		 struct spl_boot_device *bootdev,
 		 const char *filename,
@@ -340,6 +349,8 @@ int spl_mmc_load(struct spl_image_info *spl_image,
 		}
 	}
 
+	raw_sect = spl_mmc_get_uboot_raw_sector(mmc);
+
 	boot_mode = spl_boot_mode(bootdev->boot_device);
 	err = -EINVAL;
 	switch (boot_mode) {