images: tiny-initramfs: support read/write env value on bootloader

Recovery system will read/write environment value on bootloader
to switch recovery or linux system.

meta-i2som-yocto/recipes-core/images/i2som-image-tiny-initramfs.bb

@@ -1,11 +1,20 @@
 #
 # Copyright (C) 2017 i2SOM Team.
 #
-DESCRIPTION = "i2SOM Yocto busybox only based initramfs image."
+
+DESCRIPTION = "i2SOM Recovery system image."
 
 include i2som-image-tiny.bb
 
+IMAGE_INSTALL += " \
+	tslib-calibrate \
+	tslib-conf \
+	tslib-tests \
+	mmc-utils \
+	u-boot-fw-utils \
+"
+
 export IMAGE_BASENAME = "i2som-image-tiny-initramfs"
 
-IMAGE_FSTYPES = "cpio.gz "
+IMAGE_FSTYPES = "cpio.gz ext4.gz ext2.gz"
 inherit image_types_uboot