ARM: dts: msm: Add DT support for MSM8909 PM8916 qHD RCM variants

Add DT support for MSM8909 PM8916 qHD RCM variants.
While at it, also fix the board id for MSM8909 PM8916
720p 1gb RCM variant. Also remove stale RCM DT files.

Change-Id: Iae57866353f9daaa78b4d01c50494975640f5b43
Signed-off-by: Kishan Kumar <kishank@codeaurora.org>