ARM: dts: msm: match apq8026-w and msm8226-w with proper device tree

All apq8026-w and msm8226-w variants have subtype id 4 for 320p display
panel.  Club 1080p and 720p dts files which are not correct into 320p.

CRs-fixed: 644664
Change-Id: I09279a81b2452b0a1b66bcbeb3195c437f9864bb
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>