[patch] drivers, mfd: fix link error

[David Rientjes]

CONFIG_MFD_CROS_EC requires CONFIG_MFD_CORE for a couple of functions that 
are declared but not defined:

	ERROR: "mfd_remove_devices" [drivers/mfd/cros_ec.ko] undefined!
	ERROR: "mfd_add_devices" [drivers/mfd/cros_ec.ko] undefined!

Fix it by selecting CONFIG_MFD_CORE anytime CONFIG_MFD_CROS_EC is enabled.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 drivers/mfd/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -23,6 +23,7 @@ config MFD_88PM860X
 
 config MFD_CROS_EC
 	tristate "Support ChromeOS Embedded Controller"
+	select MFD_CORE
 	help
 	  If you say Y here you get support for the ChromeOS Embedded
 	  Controller (EC) providing keyboard, battery and power services.
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