msm: camera: isp: Replaces incorrect headers

Header file mach/board.h is unneeded and used wrongly. The actually
needed header is linux/of_device.h
Header file mach/vreg.h is unneeded

Change-Id: I49c517c6b818b2e23a1d3381556455cf65280517
Signed-off-by: Petar Sivenov <psiven@codeaurora.org>