mfd: bd957x: Fix Kconfig dependency on REGMAP_IRQ

The BD957x driver uses REGMAP_IRQ but does not 'select' to depend on
it. This can cause build failures.  Select REGMAP_IRQ for BD957X.

Fixes: 0e96926 ("mfd: bd9576: Add IRQ support")
Signed-off-by: Matti Vaittinen <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: M-Vaittinen

drivers/mfd/Kconfig

@@ -2017,6 +2017,7 @@ config MFD_ROHM_BD957XMUF
 	depends on I2C=y
 	depends on OF
 	select REGMAP_I2C
+	select REGMAP_IRQ
 	select MFD_CORE
 	help
 	  Select this option to get support for the ROHM BD9576MUF and