swrast: rename texture fetch functions (pt. 6)

swrast: rename texture fetch functions (pt. 6)

sed commands:
s/rgb9_e5/R9G9B9E5_FLOAT/g
s/r11_g11_b10f/R11G11B10_FLOAT/g
s/f_alpha_f16/A_FLOAT16/g
s/f_alpha_f32/A_FLOAT32/g
s/f_luminance_f16/L_FLOAT16/g
s/f_luminance_f32/L_FLOAT32/g
s/f_luminance_alpha_f16/LA_FLOAT16/g
s/f_luminance_alpha_f32/LA_FLOAT32/g
s/f_intensity_f16/I_FLOAT16/g
s/f_intensity_f32/I_FLOAT32/g
s/f_r_f16/R_FLOAT16/g
s/f_r_f32/R_FLOAT32/g
s/f_rg_f16/RG_FLOAT16/g
s/f_rg_f32/RG_FLOAT32/g
s/f_rgb_f16/RGB_FLOAT16/g
s/f_rgb_f32/RGB_FLOAT32/g
s/f_rgba_f16/RGBA_FLOAT16/g
s/f_rgba_f32/RGBA_FLOAT32/g
s/xbgr16161616_float/RGBX_FLOAT16/g
s/xbgr32323232_float/RGBX_FLOAT32/g

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