drawman: Disable auxiliary charger access
drawman: Disable auxiliary charger access

Drawman don't have auxiliary charger on DB, this patch turns off i2c
traffic on auxiliary charger base on board_get_charger_chip_count().

BUG=none
BRANCH=none
TEST=Make sure no i2c traffic on i2ctrace enable 4 0x30 to 0x36.

Signed-off-by: Devin Lu <052fe648504800b810f29702ef4f3db83fad68bf@quantatw.com>
Change-Id: I08f4682093461f39f2b909ffc97345db5e3ccc27
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2367422
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>
Commit-Queue: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>

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