regmap: Remove the redundant config to select hwspinlock

The hwspinlock was changed to a bool by commit d048236d
("hwspinlock: Change hwspinlock to a bool"), so we do not need
the REGMAP_HWSPINLOCK config to select hwspinlock or not.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>