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 --cc arch/arm/mach-davinci/davinci.h
Simple merge

diff --cc arch/arm/mach-davinci/devices.c
Simple merge

diff --cc arch/arm/mach-davinci/dm355.c
Simple merge

diff --cc arch/arm/mach-davinci/dm365.c
Simple merge

diff --cc arch/arm/mach-davinci/dm644x.c
Simple merge

diff --cc arch/arm/mach-davinci/dm646x.c
Simple merge