board: msm7x27a: Add machine types for 7625A SURF and FFA

7625A SURF and FFA has some differences like display
resolution (single lane DSI), different tuning parameters
for touchscreen, camera resolution. Some of these
tuning parameters results in lesser PMEM size requirements.

PMEM size allocation is done very early during the linux boot
process and at that time we can't provide a hack to detect
the 7625a using the socinfo, because these are really a
machine differences sometime induced by soc limitation and
new tuning parameters required due to it.

7625AA is also classified under 7625a_surf and 7625a_ffa
macros only.

Signed-off-by: Trilok Soni <tsoni@codeaurora.org>