update radio in mako OTA

Do incremental update of the radio image when possible.

Bug: 6977989
Change-Id: Ie1ddd4d0c5676b61896e8acd92e4d9f4a7b4e088
diff --git a/recovery.fstab b/recovery.fstab
index ff2b88f..a5788b7 100644
--- a/recovery.fstab
+++ b/recovery.fstab
@@ -4,6 +4,7 @@
 /system     ext4        /dev/block/platform/msm_sdcc.1/by-name/system
 /data       ext4        /dev/block/platform/msm_sdcc.1/by-name/userdata     length=-16384
 /cache      ext4        /dev/block/platform/msm_sdcc.1/by-name/cache
+/radio      emmc	/dev/block/platform/msm_sdcc.1/by-name/modem
 /sbl2	    emmc	/dev/block/platform/msm_sdcc.1/by-name/sbl2
 /sbl3	    emmc	/dev/block/platform/msm_sdcc.1/by-name/sbl3
 /tz	    emmc	/dev/block/platform/msm_sdcc.1/by-name/tz