regulator: hi6421v600: Fix setting wrong driver_data

Current code set "config.driver_data = sreg" but sreg only init the mutex,
the othere fields are just zero. Fix it by pass *info to config.driver_data
so each regulator can get corresponding data by rdev_get_drvdata().

Separate enable_mutex from struct hi6421_spmi_reg_info since only need one
mutex for the driver.

Fixes: d2dfd50a ("staging: hikey9xx: hi6421v600-regulator: move LDO config from DT")
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20210622043329.392072-1-axel.lin@ingics.com


Signed-off-by: Mark Brown <broonie@kernel.org>