ARM: ts4600: add basic board support

This commit adds basic support including:
MMC, Serial console

Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/configs/ts4600_defconfig b/configs/ts4600_defconfig
new file mode 100644
index 0000000..c052ded
--- /dev/null
+++ b/configs/ts4600_defconfig
@@ -0,0 +1,18 @@
+CONFIG_ARM=y
+CONFIG_TARGET_TS4600=y
+CONFIG_SPL_LIBCOMMON_SUPPORT=y
+CONFIG_SPL_LIBGENERIC_SUPPORT=y
+CONFIG_FIT=y
+CONFIG_SYS_EXTRA_OPTIONS="ENV_IS_IN_MMC"
+CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+CONFIG_SPL=y
+CONFIG_HUSH_PARSER=y
+CONFIG_CMD_BOOTZ=y
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_MMC=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_EXT4_WRITE=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_OF_LIBFDT=y