armv7: ls1021aiot: Fixing SPL compiling issues

To align with SPL change 38fed8ab and 693d4c9f, add Kconfig option
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR to defconfig, and remove
CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS.

Signed-off-by: York Sun <york.sun@nxp.com>
CC: Feng Li <feng.li_2@nxp.com>

configs/ls1021aiot_sdcard_defconfig

 CONFIG_ARM=y
 CONFIG_TARGET_LS1021AIOT=y
 CONFIG_SPL=y
+CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR=y
+CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0xe8
 CONFIG_DEFAULT_DEVICE_TREE="ls1021a-iot-duart"
 CONFIG_DM_SPI=y
 CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SPL_FSL_PBL,SD_BOOT,SD_BOOT_QSPI"

include/configs/ls1021aiot.h

@@ -96,7 +96,6 @@
 #define CONFIG_SPL_SERIAL_SUPPORT
 #define CONFIG_SPL_MMC_SUPPORT
 #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR	0xe8
-#define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS		0x400
 
 #define CONFIG_SPL_TEXT_BASE	0x10000000
 #define CONFIG_SPL_MAX_SIZE		0x1a000