Nami: Increase PWM frequency for LEDs and keyboard backlight
Nami: Increase PWM frequency for LEDs and keyboard backlight

Currently, PWM frequency is set to 100 Hz for the LEDs (all OEMs)
and the keyboard backlight (Sona).

This patch increases the frequency to 1.2kHz. This should reduce or
eliminate flickers.

Signed-off-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

BUG=b:110231398
BRANCH=none
TEST=Observe better looking LEDs and keyboard backlight on Sona

Change-Id: Ia39d95bf2db7f16256f107c2e6a1738fcdc5a603
Reviewed-on: https://chromium-review.googlesource.com/1102011
Commit-Ready: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Tested-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

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