[stable-4.4] arm64: mm: remove page_mapping check in __sync_icache_dcache

This commit has already been backported to the 3.16 and 3.18 stable branches, but is missing from the 4.4 branch. It has been in mainline since 4.7.

commit 20c27a4270c775d7ed661491af8ac03264d60fc6 Author: Shaokun Zhang zhangshaokun@hisilicon.com Date: Tue Jun 21 15:32:57 2016 +0800

arm64: mm: remove page_mapping check in __sync_icache_dcache

The commit doesn't apply cleanly to the 4.4 tree, but you can use 0868e8dd6384e454c4de80dad9167d48a9ca2987 instead, which is the existing backport to 3.18.