ARM: davinci_all_defconfig: set CONFIG_DAVINCI_WATCHDOG=y

This changes CONFIG_DAVINCI_WATCHDOG from a module to a compiled-in
option. Since the reset function has been moved out of the mach code in
commit 94f2e945 ("ARM: davinci: remove watchdog reset") and into the
watchdog driver, devices cannot reboot unless the watchdog driver is
loaded, so make it a compiled-in option so that we can always reboot, even
when modules are not loaded.

Cc: Sekhar Nori <nsekhar@ti.com>
Suggested-by: NAdam Ford <aford173@gmail.com>
Signed-off-by: NDavid Lechner <david@lechnology.com>
Signed-off-by: NSekhar Nori <nsekhar@ti.com>

arch/arm/configs/davinci_all_defconfig

@@ -129,7 +129,7 @@ CONFIG_POWER_RESET_GPIO=y
 CONFIG_SYSCON_REBOOT_MODE=m
 CONFIG_BATTERY_LEGO_EV3=m
 CONFIG_WATCHDOG=y
-CONFIG_DAVINCI_WATCHDOG=m
+CONFIG_DAVINCI_WATCHDOG=y
 CONFIG_MFD_DM355EVM_MSP=y
 CONFIG_TPS6507X=y
 CONFIG_REGULATOR=y