swrast: rename texture fetch functions (pt. 2)

swrast: rename texture fetch functions (pt. 2)

Rename functions to match format names.

sed commands:
s/f_al1616_rev/A16L16_UNORM/g
s/f_al1616/L16A16_UNORM/g
s/f_rgb565_rev/R5G6B5_UNORM/g
s/f_rgb565/B5G6R5_UNORM/g
s/f_argb4444_rev/A4R4G4B4_UNORM/g
s/f_argb4444/B4G4R4A4_UNORM/g
s/f_rgba5551/A1B5G5R5_UNORM/g
s/f_argb1555_rev/A1R5G5B5_UNORM/g
s/f_al88_rev/A8L8_UNORM/g
s/f_al88/L8A8_UNORM/g
s/f_gr88/R8G8_UNORM/g
s/f_rg88/G8R8_UNORM/g
s/f_al44/L4A4_UNORM/g
s/f_rgb332/B2G3R3_UNORM/g

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>