buildroot: Add MIPS 32-bit little endian config and check in images

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Author: nathanchance

buildroot/mipsel.config

@@ -0,0 +1,15 @@
+BR2_mipsel=y
+BR2_OPTIMIZE_3=y
+BR2_KERNEL_HEADERS_4_4=y
+BR2_BINUTILS_VERSION_2_31_X=y
+BR2_GCC_VERSION_8_X=y
+BR2_TARGET_GENERIC_ROOT_PASSWD="root"
+BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
+BR2_ROOTFS_OVERLAY="../overlay-poweroff"
+BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+BR2_PACKAGE_BASH=y
+BR2_TARGET_ROOTFS_CPIO=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="20M"
+# BR2_TARGET_ROOTFS_TAR is not set

buildroot/rebuild.sh

@@ -25,7 +25,7 @@ CONFIGS=()
 while (( ${#} )); do
     case ${1} in
         all) for CONFIG in *.config; do CONFIGS+=( "../${CONFIG}" ); done ;;
-        arm64|arm|ppc32|ppc64le|x86_64) CONFIGS+=( "../${1}.config" ) ;;
+        arm64|arm|mipsel|ppc32|ppc64le|x86_64) CONFIGS+=( "../${1}.config" ) ;;
         *) echo "Unknown parameter '${1}', exiting!"; exit 1 ;;
     esac
     shift