Linux 4.19.40

Merge 24 patches from 4.19.40 stable
branch (24 total) beside 0 already merged.
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

Makefile

 # SPDX-License-Identifier: GPL-2.0
 VERSION = 4
 PATCHLEVEL = 19
-SUBLEVEL = 39
+SUBLEVEL = 40
 EXTRAVERSION =
 NAME = "People's Front"