msm: board-msm7627a-display: Create separate board file for display

Various variants of 7627a uses common display code which is
duplicated over multiple board files. So, move out the common
code for display into separate board file to avoid rebase
issues during new board bring up and maintenance.

Change-Id: Ibf3558e5b26dfbd9f056c0f5f78f4bf8573ca642
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>