msm: kgsl: Add dedicated boolean functions for adreno sysfs

Instead of gloaming the boolean adreno sysfs functions onto the u32
functions give them their own dedicated functions that deal with native
booleans from top to bottom.  This allows for a bit of code cleanup but
more importantly fixes the logical disconnect of switching back and forth
between u32 and bool.

Change-Id: Ic0dedbadc5b669b5131ff232d80d25ef5486b85e
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>