Fix permissions of drivers/power/avs/rockchip-io-domain.c

The permissions of this file were modified by commit (f447671b9e4f PM /
AVS: rockchip-io: add io selectors and supplies for rk3399) by mistake,
so fix them.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/power/avs/rockchip-io-domain.c b/drivers/power/avs/rockchip-io-domain.c
old mode 100755
new mode 100644