[PATCH] regulator: bd71815: add select to fix build

[Randy Dunlap]

Mend the Kconfig for REGULATOR_BD71815 to prevent build errors:

riscv32-linux-ld: drivers/regulator/bd71815-regulator.o: in function `.L0 ':
regulator.c:289: undefined reference to `rohm_regulator_set_dvs_levels'
riscv32-linux-ld: drivers/regulator/bd71815-regulator.c:370: undefined reference to `rohm_regulator_set_dvs_levels'

Fixes: 1aad39001e85 ("regulator: Support ROHM BD71815 regulators")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx>
Cc: Lee Jones <lee.jones@xxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Liam Girdwood <lgirdwood@xxxxxxxxx>
---
 drivers/regulator/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20210521.orig/drivers/regulator/Kconfig
+++ linux-next-20210521/drivers/regulator/Kconfig
@@ -207,6 +207,7 @@ config REGULATOR_BD70528
 config REGULATOR_BD71815
 	tristate "ROHM BD71815 Power Regulator"
 	depends on MFD_ROHM_BD71828
+	select REGULATOR_ROHM
 	help
 	  This driver supports voltage regulators on ROHM BD71815 PMIC.
 	  This will enable support for the software controllable buck