board/olpc/xo-1: enable STAGING

The DCON driver for the platform is a staging driver.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/olpc/xo-1/linux.config

@@ -64,6 +64,7 @@ CONFIG_SND_CS5535AUDIO=y
 CONFIG_USB_EHCI_ROOT_HUB_TT=y
 CONFIG_USB_OHCI_HCD=y
 CONFIG_MMC_SDHCI_PCI=y
+CONFIG_STAGING=y
 CONFIG_FB_OLPC_DCON=y
 CONFIG_XO1_RFKILL=y
 CONFIG_RESET_CONTROLLER=y