auron/peppy: fix setting fan max speed by rpm instead of duty cycle
auron/peppy: fix setting fan max speed by rpm instead of duty cycle

Setting initial max speed works by setting RPM but fails when
setting with duty cycle

BUG=chrome-os-partner:31801
TEST=booted on auron and peppy and confirmed that initial fan speed is
set to maximum
BRANCH=none

Change-Id: I81172a414df13c2e0b2d0f4fe7ff1270fa5f60a3
Signed-off-by: Mohammed Habibulla <8a503cc33e9ca0fe4680ecfe79b9e9ed9e1c57a0@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/217790
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

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