msm: kgsl: Refactor the setting of features over HFI

There will be more features added to be disabled or
enabled over HFI. Some of these will change at runtime.
Refactor the code that sends these HFIs to make
adding new ones easier. Also, make the printing of
feature setting errors prettier.

Change-Id: Idf1576c320f5d2f997633d35fc8e1e1069b85882
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>