led/tlc59116f: Set brightness before driver disable
led/tlc59116f: Set brightness before driver disable

Set brightness to 0 before disable rgbkb backlight to make sure
keyboard backlight is off.

BUG=b:251332820
BRANCH=brya
TEST=mithrax can close rgbkb backlight when lid close

Signed-off-by: Leila Lin <cc1f24b6adbc518cdcd2be4273a2f22668348890@compal.corp-partner.google.com>
Change-Id: I3fc1e2139608c2db142c52dc82d96a111d2f3bc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3971237
Reviewed-by: caveh jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Reviewed-by: Ricky Chang <59d9ca39678b466cde708cb957c19c9165cf3fac@chromium.org>
Commit-Queue: LeilaCY Lin <cc1f24b6adbc518cdcd2be4273a2f22668348890@compal.corp-partner.google.com.test-google-a.com>
Tested-by: LeilaCY Lin <cc1f24b6adbc518cdcd2be4273a2f22668348890@compal.corp-partner.google.com.test-google-a.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec