mm/memory: pass folio into do_page_mkwrite()

mm/memory: pass folio into do_page_mkwrite()

Saves one implicit call to compound_head().

I'm not sure if I should change the name of the function to
do_folio_mkwrite() and update the description comment to reference a folio
as the vm_op is still called page_mkwrite.

Link: https://lkml.kernel.org/r/20230711053544.156617-1-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Suggested-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>