msm7x30-common: Add common keylayouts

moved from all devices here

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

Change-Id: I559d0757091d2fb2e9edb2f1e027aa22ae0428b2
msm7x30: Refactor to common init

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

Change-Id: Ie6cf0df280f3f286045188df62f9b851a6a9f02f