build: Disable Punjabi & Sinhala languages

* These languages do not render properly.
Disable them until we fix the issue

Change-Id: I04f26ab4146925661a4a5b97308eb919c5dc1de2
releasetools: Add radio images to fastboot packages

Fastboot packages should include radio images, if they exist. Also
generate a flash-radio.sh file if a filesmap file exists to indicate
the partition that a radio image should be flashed to.

Change-Id: Ic3392cc76407408b98aad00f36f4dfa3b9be176b