msm: board-qrd7627a: Add gpio regulator for ov8825 sensor

Use gpio regulator driver for ov8825 (8MP) sensor as the
power related gpios are shared between the sensor and
lcd display.

Change-Id: Id6a4cc88dadd28c57135052c1dad43065d336f9b
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@codeaurora.org>