da850-evm: KEYBOARD_GPIO_POLLED Kconfig conditional

Use the mach-davinci/Kconfig to enable gpio-keys-polled as default when
da850-evm machine is enabled.

Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
CC: Kevin Hilman <khilman@deeprootsystems.com>
CC: "Nori, Sekhar" <nsekhar@ti.com>
CC: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-davinci/Kconfig

@@ -190,6 +190,9 @@ endchoice
 config GPIO_PCA953X
 	default MACH_DAVINCI_DA850_EVM
 
+config KEYBOARD_GPIO_POLLED
+	default MACH_DAVINCI_DA850_EVM
+
 config MACH_TNETV107X
 	bool "TI TNETV107X Reference Platform"
 	default ARCH_DAVINCI_TNETV107X