zephyr test: Check charging in 5V charger test
zephyr test: Check charging in 5V charger test

Check charging state after attaching 5V 3A charger. Rename the 5V and
20V charger tests to more accurately distinguish between them.

BUG=b:216830930
TEST=zmake testall
BRANCH=none

Signed-off-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>
Change-Id: If656def75036e20ceae40dd816e1ff4afc6a6bcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3425637
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>

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