build: build Exchange

This will allow exchange to build for real :-)

Change-Id: I281b3c2b4617c8a3a800f205898f91270fa43acc
Fix perm for boot_flash_from_image

Change-Id: I656018bd9dfa79646233a8a5b72164f7fd93d880
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>
Merge remote-tracking branch 'slim/lp5.0' into lp50s-test

Conflicts:
	target/product/generic_no_telephony.mk