mfd: da9063: Allow modular build

Allow support for the DA9063 PMIC to be modular, cfr. DA9062, which
allows to decrease size of multi-platform kernels (e.g.
multi_v7_defconfig).

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9581ebb..9ca66de 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -211,7 +211,7 @@
 	  of the device.
 
 config MFD_DA9063
-	bool "Dialog Semiconductor DA9063 PMIC Support"
+	tristate "Dialog Semiconductor DA9063 PMIC Support"
 	select MFD_CORE
 	select REGMAP_I2C
 	select REGMAP_IRQ