msm_fb: HDMI: Turn on HDMI core only for supported resolution

Upon receiving the notification of an HDMI cable connection,
turn on HDMI core only if the default video resolution is
supported by the sink. Otherwise, HDMI core would be turned
on at a later time when it is configured with a supported
resolution by the userspace.

CRs-Fixed: 412575
Change-Id: I67cfb09bafa39646839877a66cd94f193c127a76
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>