msm7x30-common: some cleanup

* Removed useless & incorrect PRODUCT_MANUFACTURER definition
* Added & fixed some comments to the source files
* Deleted unused file recovery_ui.c
* Clean up recovery_keys.c according to bootable/recovery/
* Move gsm feature xml to mogami-common & zeus

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I1e94132ca9491a34e8d5c817d639765401d60bd0