[ARM] omap: watchdog: allow OMAP watchdog driver on OMAP34xx platforms

The driver was updated for OMAP34xx, but the Kconfig file was missed.
So this adds the missing parts from d99241c in Tony Lindgren's tree:

    Add watchdog timer support for TI OMAP3430.
Signed-off-by: Madhusudhan Chikkature <madhu.cr@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/watchdog/Kconfig

@@ -187,10 +187,10 @@ config EP93XX_WATCHDOG
 
 config OMAP_WATCHDOG
 	tristate "OMAP Watchdog"
-	depends on ARCH_OMAP16XX || ARCH_OMAP24XX
+	depends on ARCH_OMAP16XX || ARCH_OMAP24XX || ARCH_OMAP34XX
 	help
-	  Support for TI OMAP1610/OMAP1710/OMAP2420 watchdog.  Say 'Y' here to
-	  enable the OMAP1610/OMAP1710 watchdog timer.
+	  Support for TI OMAP1610/OMAP1710/OMAP2420/OMAP3430 watchdog.  Say 'Y'
+	  here to enable the OMAP1610/OMAP1710/OMAP2420/OMAP3430 watchdog timer.
 
 config PNX4008_WATCHDOG
 	tristate "PNX4008 Watchdog"