nb/intel/i945/gma: Factor out code to new `gma_ngi()`

This helps with meeting the line length limit.

Also, join some lines with the one above, as the line length is now met.

Change-Id: If457b3b592211aba1a3218501146b17abb5b799f
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/25876
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed