it83xx: clock: misc fixes
it83xx: clock: misc fixes

1. Disable USB debug interface:
If we don't use GPIOH.5/6 pins for debugging,
we should disable it to prevent any chances of entering debug mode.

2. command_idle_stats() behind CONFIG_CMD_IDLE_STATS:
We can exclude this console command if we don't use it.

3. Remove 'dsleep' console command:
DEEP_SLEEP_ALLOWED macro is enough for us.

BRANCH=none
BUG=none
TEST=bit7 at 0xF02030(MCCR register) is cleared after initialization.

Change-Id: If34e9738351459891be8c9a6619384adbfe26335
Signed-off-by: Dino Li <338d523ecf3700bd86eb9c34d220f91911d2a18c@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/487843
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

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