msm_fb: HDMI: Add proper config check for HDMI on 7x30

Add proper configuration check for allocating external memory
on 7x30 devices

Change-Id: I3409184c33f28d8d9097ea99d9a24d17a25619a6
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>
1 file changed