clocksource/drivers/npcm: Add support for WPCM450

Add a compatible string for WPCM450, which has essentially the same
timer controller.

Signed-off-by: Jonathan Neuschäfer <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/clocksource/timer-npcm7xx.c

···
 	return 0;
 }
 
+TIMER_OF_DECLARE(wpcm450, "nuvoton,wpcm450-timer", npcm7xx_timer_init);
 TIMER_OF_DECLARE(npcm7xx, "nuvoton,npcm750-timer", npcm7xx_timer_init);