Some occurrences of regmap_update_bits can be simplified by
using other regmap commands. Use set_bits/clear_bits/assign_bits
for better readability.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/23039
Signed-off-by: Robert Marko <robimarko@gmail.com>