msm: camera: Add LED flash support on MTP and Fluid

Both LED and strobe flash shares same GPIO pins on CDP.
For CDP, we use gpio expander to support both features,
but on MTP and Fluid, gpio expander is not present.
This change set the default flash gpio mux config to
be use by MTP and Fluid. GPIO mux config will be update
if device is CDP. Also added some delay for the SC628A
chip to enable.

Change-Id: I459e3ec6f13f3ef374fabca850e476461627da9f
Signed-off-by: Kevin Chan <ktchan@codeaurora.org>