MMC SD fs boot partition config coding style and proper description

CONFIG_SYS_MMC_SD_FS_BOOT_PARTITION ought to be called
CONFIG_SYS_MMCSD_FS_BOOT_PARTITION to keep it consistent with other config
options such as: CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR.

In addition, it is not related to raw mode booting but to fs mode instead.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/ti816x_evm.h b/include/configs/ti816x_evm.h
index aeabb1b..87a4efc 100644
--- a/include/configs/ti816x_evm.h
+++ b/include/configs/ti816x_evm.h
@@ -144,7 +144,7 @@
 
 #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR 0x300 /* address 0x60000 */
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS      0x200 /* 256 KB */
-#define CONFIG_SYS_MMC_SD_FS_BOOT_PARTITION    1
+#define CONFIG_SYS_MMCSD_FS_BOOT_PARTITION     1
 #define CONFIG_SPL_FS_LOAD_PAYLOAD_NAME        "u-boot.img"
 #define CONFIG_SPL_MMC_SUPPORT
 #define CONFIG_SPL_FAT_SUPPORT