Remove conditional declaration of charge_want_shutdown()
Remove conditional declaration of charge_want_shutdown()

This is only used in power_button_x86.c, which always defines
CONFIG_CHARGER, so there's no need to make it conditional.

BRANCH=ToT
BUG=chrome-os-partner:23776
TEST=make buildall -j

Change-Id: I415572e691cc5bd6b189f9d3dd737b4209c33669
Signed-off-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/190851
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

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