configs/buildroot: don't create images by buildroot

There is no need to create cpio, tar and bzip2 images, since we don't use them
anyway. We assemble images on our own in build/scripts/wrs_build_wraprootfs.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

configs/buildroot/wrs_release_br2_config

@@ -605,7 +605,7 @@ BR2_PACKAGE_MTD_FLASH_UNLOCK=y
 # BR2_PACKAGE_MTD_FTL_CHECK is not set
 # BR2_PACKAGE_MTD_FTL_FORMAT is not set
 # BR2_PACKAGE_MTD_JFFS2DUMP is not set
-BR2_PACKAGE_MTD_MKFSJFFS2=y
+# BR2_PACKAGE_MTD_MKFSJFFS2 is not set
 # BR2_PACKAGE_MTD_MKFSUBIFS is not set
 BR2_PACKAGE_MTD_MTD_DEBUG=y
 # BR2_PACKAGE_MTD_MTDPART is not set
@@ -2539,14 +2539,7 @@ BR2_PACKAGE_NANO_TINY=y
 #
 # BR2_TARGET_ROOTFS_AXFS is not set
 # BR2_TARGET_ROOTFS_CLOOP is not set
-BR2_TARGET_ROOTFS_CPIO=y
-BR2_TARGET_ROOTFS_CPIO_NONE=y
-# BR2_TARGET_ROOTFS_CPIO_GZIP is not set
-# BR2_TARGET_ROOTFS_CPIO_BZIP2 is not set
-# BR2_TARGET_ROOTFS_CPIO_LZMA is not set
-# BR2_TARGET_ROOTFS_CPIO_LZO is not set
-# BR2_TARGET_ROOTFS_CPIO_XZ is not set
-# BR2_TARGET_ROOTFS_CPIO_UIMAGE is not set
+# BR2_TARGET_ROOTFS_CPIO is not set
 # BR2_TARGET_ROOTFS_CRAMFS is not set
 # BR2_TARGET_ROOTFS_EXT2 is not set
 
@@ -2556,14 +2549,7 @@ BR2_TARGET_ROOTFS_CPIO_NONE=y
 # BR2_TARGET_ROOTFS_JFFS2 is not set
 # BR2_TARGET_ROOTFS_ROMFS is not set
 # BR2_TARGET_ROOTFS_SQUASHFS is not set
-BR2_TARGET_ROOTFS_TAR=y
-# BR2_TARGET_ROOTFS_TAR_NONE is not set
-# BR2_TARGET_ROOTFS_TAR_GZIP is not set
-BR2_TARGET_ROOTFS_TAR_BZIP2=y
-# BR2_TARGET_ROOTFS_TAR_LZMA is not set
-# BR2_TARGET_ROOTFS_TAR_LZO is not set
-# BR2_TARGET_ROOTFS_TAR_XZ is not set
-BR2_TARGET_ROOTFS_TAR_OPTIONS=""
+# BR2_TARGET_ROOTFS_TAR is not set
 # BR2_TARGET_ROOTFS_UBIFS is not set
 # BR2_TARGET_ROOTFS_YAFFS2 is not set