Fix Kconfig dependency for WM97xx battery driver

It needs the WM97xx touchscreen driver to be compiled in, not as a
module.  And it cannot itself be a module, due to some unfortunate
interactions with platform data.

Reported-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 1982f8b..63bb579 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -58,7 +58,7 @@
 
 config BATTERY_WM97XX
 	bool "WM97xx generic battery driver"
-	depends on TOUCHSCREEN_WM97XX
+	depends on TOUCHSCREEN_WM97XX=y
 	help
 	  Say Y to enable support for battery measured by WM97xx aux port.