ARM: davinci: da8xx: fix multiple watchdog device registration

Fix multiple watchdog device registration on da8xx devices
due to davinci_init_devices blindly registering watchdog
device.

Fix this by getting rid of the initcall and instead registering
watchdog for each soc.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
diff --git a/arch/arm/mach-davinci/davinci.h b/arch/arm/mach-davinci/davinci.h
index 2eebc43..4ffc37a 100644
--- a/arch/arm/mach-davinci/davinci.h
+++ b/arch/arm/mach-davinci/davinci.h
@@ -79,6 +79,8 @@
 #define DM646X_ASYNC_EMIF_CONTROL_BASE	0x20008000
 #define DM646X_ASYNC_EMIF_CS2_SPACE_BASE 0x42000000
 
+int davinci_init_wdt(void);
+
 /* DM355 function declarations */
 void dm355_init(void);
 void dm355_init_spi0(unsigned chipselect_mask,