MIPS: MIPS32r1: Optimization of filter functions. PATCH [5/6]

Change-Id: Ifbd305e0514f09a587db02c3970f22190808503a
Added support for calling sampling functions via pointers.

Change-Id: Ic4d72e6b175a6b27bcdcc8cd97828e44ea93e743
MIPS: MIPS32r1: Optimization of some simple point-sampling functions. PATCH [6/6]

Change-Id: I2020e71e9be5d17d4bf67cabf6c470ca43d5d838
cosmetics: *_mips32.c

indent, comments, unused includes

Change-Id: Id0aabc52d05bb633f62aec022155ec27699cf5a0