leds: bcm6328: Replace divide condition with comparison for shift value

leds: bcm6328: Replace divide condition with comparison for shift value

Fixes the following Smatch warnings:
drivers/leds/leds-bcm6328.c:116 bcm6328_led_mode() warn: replace divide condition 'shift / 16' with 'shift >= 16'
drivers/leds/leds-bcm6328.c:360 bcm6328_led() warn: replace divide condition 'shift / 16' with 'shift >= 16'

Signed-off-by: Dipendra Khadka <kdipendra88@gmail.com>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Link: https://lore.kernel.org/r/20241019073302.35499-1-kdipendra88@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>