wm8400-core: select REGMAP_I2C in kconfig

[Dave Jones]

wm8400-core.c is using the regmap I2C API, so needs to select it.

ERROR: "regmap_write" [drivers/mfd/wm8400-core.ko] undefined!
ERROR: "regmap_raw_read" [drivers/mfd/wm8400-core.ko] undefined!
ERROR: "regmap_read" [drivers/mfd/wm8400-core.ko] undefined!
ERROR: "regmap_init_i2c" [drivers/mfd/wm8400-core.ko] undefined!
ERROR: "regmap_bulk_read" [drivers/mfd/wm8400-core.ko] undefined!
ERROR: "regmap_exit" [drivers/mfd/wm8400-core.ko] undefined!

Signed-off-by: Dave Jones <davej@xxxxxxxxxx>

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index a67adcb..67a6126 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -389,6 +389,7 @@ config MFD_MAX8998
 config MFD_WM8400
 	tristate "Support Wolfson Microelectronics WM8400"
 	select MFD_CORE
+	select REGMAP_I2C
 	depends on I2C
 	help
 	  Support for the Wolfson Microelecronics WM8400 PMIC and audio
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