There is no point in protecting a register read with a lock. This is
most likely a leftover from when the driver was reworked before being
submitted for upstream.
Signed-off-by: NNiklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NEduardo Valentin <edubezval@gmail.com>