Nissa: modify Amber LED RGB setting
Nissa: modify Amber LED RGB setting

<R, G, B> = <70, 30, 0>

BUG=b:235304497
BRANCH=none
TEST=check Amber LED as expected

Signed-off-by: Sue Chen <7d23cdcf270f71747b77aeecc793a9342f6d5c9e@quanta.corp-partner.google.com>
Change-Id: Ic62ae98fbd45d4e92863b8aa31b1b83dc75969a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3716416
Reviewed-by: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@google.com>

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