BACKPORT: xtensa: implement the new page table range API

Add PFN_PTE_SHIFT, update_mmu_cache_range(), flush_dcache_folio() and
flush_icache_pages().

Link: https://lkml.kernel.org/r/20230802151406.3735276-30-willy@infradead.org


Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

(cherry picked from commit 4fbb7e7f)
[Ryan: Resolved minor conflict in arch/xtensa/include/asm/pgtable.h]
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>