soc/intel: Obsolete mmap_region_granularity()

Change-Id: I471598d3ce61b70e35adba3bd983f5d823ba3816
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34696
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

Documentation/Intel/SoC/soc.html

@@ -148,7 +148,6 @@ mv build/coreboot.rom.new build/coreboot.rom
   <li>Edit the src/soc/&lt;Vendor&gt;/&lt;Chip Family&gt;/memmap.c file
     <ol type="A">
       <li>Add the fsp/memmap.h include file</li>
-      <li>Add the mmap_region_granularity routine</li>
     </ol>
   </li>
   <li>Add the necessary .h files to define the necessary values and structures</li>