zephyr test: Verify drp_auto_toggle_next_state
zephyr test: Verify drp_auto_toggle_next_state

Verify that drp_auto_toggle_next_state returns a state appropriate to
the CC voltages and current state.

BUG=b:256182103
TEST=twister -s zephyr/test/drivers/drivers.usb_common
BRANCH=none

Signed-off-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>
Change-Id: I411c8f31379e5f7ae9a2899c3a4cb659bc328b3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3995815
Code-Coverage: Zoss <345cf107e82c70959d46f59d98bddc98ce458aff@prod.google.com>
Reviewed-by: Tomasz Michalec <c064a6042954d4ba0805003dc021b76413ff1548@google.com>

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