regulator: core: Add back the const qualifier for ops of struct regulator_desc
Fix below build warning:
CC [M] drivers/regulator/hi6421-regulator.o
drivers/regulator/hi6421-regulator.c:356:2: warning: initialization discards 'const' qualifier from pointer target type [enabled by default]
This is a revert of commit
716845ebeb50 ("regulator: core: Fix build error due
to const qualifier for ops"). The build error was fixed by commit
39f5460d7f9c
("regulator: core: add const to regulator_ops and fix build error in mc13892").
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>