cleanup: remove obsolete declaration from header
cleanup: remove obsolete declaration from header

When we cleaned up the alternate function GPIO initialization, we left a
declaration for configure_fan_gpios() in fan.h. That function doesn't exist
anywhere, so there's no point in declaring it.

BUG=chrome-os-partner:18343
BRANCH=none
TEST=manual

Build everything. Nothing fails.

Change-Id: I3d1fe1ff62e523aa7c87d57c5e838b01a0c6e899
Signed-off-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174334
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

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