mips: mtmips: enable SPL for all boards

This patch enables SPL for all mtmips boards. And also remove defconfig
files which are intend to build ram bootable u-boot files.

SPL_DM and OF_CONTROL are enabled for both boards.

Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/configs/linkit-smart-7688_defconfig b/configs/linkit-smart-7688_defconfig
index 34066dd..629c33a 100644
--- a/configs/linkit-smart-7688_defconfig
+++ b/configs/linkit-smart-7688_defconfig
@@ -1,12 +1,15 @@
 CONFIG_MIPS=y
-CONFIG_SYS_TEXT_BASE=0x9c000000
+CONFIG_SPL_LIBCOMMON_SUPPORT=y
+CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_ENV_SIZE=0x4000
-CONFIG_ENV_SECT_SIZE=0x10000
 CONFIG_ENV_OFFSET=0x80000
+CONFIG_ENV_SECT_SIZE=0x10000
+CONFIG_SPL_SERIAL_SUPPORT=y
+CONFIG_SPL_SYS_MALLOC_F_LEN=0x20000
 CONFIG_NR_DRAM_BANKS=1
+CONFIG_SPL=y
 CONFIG_ARCH_MTMIPS=y
 CONFIG_BOARD_LINKIT_SMART_7688=y
-CONFIG_BOOT_ROM=y
 CONFIG_RESTORE_EXCEPTION_VECTOR_BASE=y
 # CONFIG_MIPS_BOOT_ENV_LEGACY is not set
 CONFIG_MIPS_BOOT_FDT=y
@@ -16,6 +19,8 @@
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
+CONFIG_SPL_NOR_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_LICENSE=y
 # CONFIG_CMD_ELF is not set
@@ -39,6 +44,7 @@
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_SPL_DM=y
 # CONFIG_DM_DEVICE_REMOVE is not set
 CONFIG_BLK=y
 CONFIG_LED=y
@@ -65,3 +71,4 @@
 CONFIG_FS_FAT=y
 CONFIG_LZMA=y
 CONFIG_LZO=y
+CONFIG_SPL_LZMA=y