Preserve PWM module state across system jump
Preserve PWM module state across system jump

If we don't store PWM module state, fan would be disabled after system
jump until the next reboot. Let's preserve fan and keyboard backlight
state.

BUG=chrome-os-partner:11027
TEST=Boot and "sysjump a". Check fan is still enabled.

Change-Id: I57dbcabef79264af7fcedb8fa0c00ff6299b97d5
Reviewed-on: https://gerrit.chromium.org/gerrit/26757
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Tested-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Commit-Ready: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>

fourier49/BZ_DEV_EC,eatbyte/chromium-ec,thehobn/ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,thehobn/ec,coreboot/chrome-ec,gelraen/cros-ec,longsleep/ec,mtk09422/chromiumos-platform-ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,longsleep/ec,fourier49/BIZ_EC,gelraen/cros-ec,md5555/ec,gelraen/cros-ec,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,coreboot/chrome-ec,alterapraxisptyltd/chromium-ec,md5555/ec,fourier49/BZ_DEV_EC,alterapraxisptyltd/chromium-ec,eatbyte/chromium-ec,fourier49/BZ_DEV_EC,fourier49/BZ_DEV_EC,longsleep/ec,md5555/ec,thehobn/ec,eatbyte/chromium-ec,alterapraxisptyltd/chromium-ec,coreboot/chrome-ec,gelraen/cros-ec,fourier49/BIZ_EC,fourier49/BIZ_EC,md5555/ec,eatbyte/chromium-ec,thehobn/ec,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,longsleep/ec,alterapraxisptyltd/chromium-ec,coreboot/chrome-ec