Unify Find 7 TWRP builds

Tests report that this works on both Find 7 models.
This patch set modifies mkbootimg.mk to copy the 1440x2560 theme
into a separate folder. The init library sets ro.oppo.device to
find7s if the QHD screen is present. The init.recovery.find7.rc
will copy the 1440x2560 theme into the res folder during init so
that TWRP will have the proper theme for the higher resolution
screen.

PS3:
-rename init.recovery.qcom.rc
-changed cp command

Change-Id: I3544a0b6899c119ed02e38d8e1b3492cf2823736