drivers: misc: pn547: Avoid KP if pvdd_en_gpio is invalid.
drivers: video: msm: mdss: Add ifdefs in mdss_dsi.h

Some structures, definitions and enumerations are needed only for
Sony's unified display driver.
Use ifdefs around those, so that the code will be "marked" and
it'll be easier to read (and easier to port elsewhere if needed).
Merge pull request #75 from kholk/aosp/LNX.LA.3.5.2.2-03010-8x74.0

drivers: misc: pn547: Avoid KP if pvdd_en_gpio is invalid.