of: rename of_aliases_mutex to just of_mutex

We're overloading usage of of_aliases_mutex for sysfs changes,
so rename to something that is more generic.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>

diff --cc drivers/of/base.c
Simple merge

diff --cc drivers/of/device.c
Simple merge

diff --cc drivers/of/of_private.h
Simple merge