mesa: Change many Type A MESA_FORMATs to meet naming standard

mesa: Change many Type A MESA_FORMATs to meet naming standard

Update comments. Conversion of the following Type A formats:
    s/MESA_FORMAT_RGB888\b/MESA_FORMAT_BGR_UNORM8/g
    s/MESA_FORMAT_BGR888\b/MESA_FORMAT_RGB_UNORM8/g
    s/MESA_FORMAT_A8\b/MESA_FORMAT_A_UNORM8/g
    s/MESA_FORMAT_A16\b/MESA_FORMAT_A_UNORM16/g
    s/MESA_FORMAT_L8\b/MESA_FORMAT_L_UNORM8/g
    s/MESA_FORMAT_L16\b/MESA_FORMAT_L_UNORM16/g
    s/MESA_FORMAT_I8\b/MESA_FORMAT_I_UNORM8/g
    s/MESA_FORMAT_I16\b/MESA_FORMAT_I_UNORM16/g
    s/MESA_FORMAT_R8\b/MESA_FORMAT_R_UNORM8/g
    s/MESA_FORMAT_R16\b/MESA_FORMAT_R_UNORM16/g
    s/MESA_FORMAT_Z16\b/MESA_FORMAT_Z_UNORM16/g
    s/MESA_FORMAT_Z32\b/MESA_FORMAT_Z_UNORM32/g
    s/MESA_FORMAT_S8\b/MESA_FORMAT_S_UINT8/g
    s/MESA_FORMAT_SRGB8\b/MESA_FORMAT_BGR_SRGB8/g
    s/MESA_FORMAT_RGBA_16\b/MESA_FORMAT_RGBA_UNORM16/g
    s/MESA_FORMAT_SL8\b/MESA_FORMAT_L_SRGB8/g
    s/MESA_FORMAT_Z32_FLOAT\b/MESA_FORMAT_Z_FLOAT32/g
    s/MESA_FORMAT_XBGR16161616_UNORM\b/MESA_FORMAT_RGBX_UNORM16/g
    s/MESA_FORMAT_XBGR16161616_SNORM\b/MESA_FORMAT_RGBX_SNORM16/g
    s/MESA_FORMAT_XBGR16161616_FLOAT\b/MESA_FORMAT_RGBX_FLOAT16/g
    s/MESA_FORMAT_XBGR16161616_UINT\b/MESA_FORMAT_RGBX_UINT16/g
    s/MESA_FORMAT_XBGR16161616_SINT\b/MESA_FORMAT_RGBX_SINT16/g
    s/MESA_FORMAT_XBGR32323232_FLOAT\b/MESA_FORMAT_RGBX_FLOAT32/g
    s/MESA_FORMAT_XBGR32323232_UINT\b/MESA_FORMAT_RGBX_UINT32/g
    s/MESA_FORMAT_XBGR32323232_SINT\b/MESA_FORMAT_RGBX_SINT32/g
    s/MESA_FORMAT_XBGR8888_UINT\b/MESA_FORMAT_RGBX_UINT8/g
    s/MESA_FORMAT_XBGR8888_SINT\b/MESA_FORMAT_RGBX_SINT8/g