m8spr: inherit m8spr-specific vendor tree

Change-Id: I951aaf36a8878a2fc9e05c3dd07e076fcadcfb1c
m8spr: commonize prop lists

Change-Id: I687b3a49c8b673167b0cd3eba6974547d7d01445
m8spr: add system.prop

Change-Id: I33ae0f53271a4843040e021218447debaee35053