leds: st1202: Give the channel current ceiling a single helper

The channel current register is 8 bits wide, while max_brightness comes
from the device tree and can be larger. The brightness, pattern and
blink paths each apply that limit on their own, open-coding the same
min_t() against U8_MAX, and the blink path previously drifted from the
others by ignoring max_brightness altogether.

Move the limit into st1202_iled_max() and use it in all three places.
Each path programs the same value as before: the LED core already limits
brightness to max_brightness, so capping it against st1202_iled_max() in
st1202_led_set() gives the same result as capping it against U8_MAX.

Signed-off-by: Manuel Fombuena <fombuena@outlook.com>
Assisted-by: LLM
Link: https://patch.msgid.link/GV1PR08MB8497935DA426302FB808A81EC5BA2@GV1PR08MB8497.eurprd08.prod.outlook.com
Signed-off-by: Lee Jones <lee@kernel.org>

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