intel: Clean up check_pbo_format to ignore internalFormat.

intel: Clean up check_pbo_format to ignore internalFormat.

All that matters here is the format of the texture, not the
internalformat (which might mean various different pixel formats).  In
one case, the pbo upload for MESA_FORMAT_YCBCR would have swapped the
channels for MESA_FORMAT_YCBCR_REV.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>