gallium/swr: Enable support bptc format.

Reuse Code from:
f69bc797e1 gallium/auxiliary: Add helper support for bptc format compress/decompress

Signed-off-by: Denis Pauk <pauk.denis@gmail.com>
Reviewed-by: Bruce Cherniak <bruce.cherniak@intel.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
CC: Marek Olšák <maraeo@gmail.com>
CC: Tim Rowley <timothy.o.rowley@intel.com>

src/gallium/drivers/swr/swr_screen.cpp

          return false;
    }
 
-   if (format_desc->layout == UTIL_FORMAT_LAYOUT_BPTC ||
-       format_desc->layout == UTIL_FORMAT_LAYOUT_ASTC ||
+   if (format_desc->layout == UTIL_FORMAT_LAYOUT_ASTC ||
        format_desc->layout == UTIL_FORMAT_LAYOUT_FXT1)
    {
       return false;