[WATCHDOG] rc32434_wdt: clean-up driver

Clean-up the rc32434 driver code:
	- name the platform driver rc32434_wdt_driver
	- Replace KBUILD_MODNAME ": " with PFX define.
	- Cleanup include files
	- Order the ioctl's

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>