cleanup: Clarify usage of CONFIG_CHARGER_INPUT_CURRENT
cleanup: Clarify usage of CONFIG_CHARGER_INPUT_CURRENT

Add additional comments on the usage of CONFIG_CHARGER_INPUT_CURRENT for
type-C.

BUG=chrome-os-partner:42933
TEST=Passes pre-submit check
BRANCH=None

Signed-off-by: Shawn Nematbakhsh <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
Change-Id: I00458c16fa4671f26fb00fe3ca1265ebc22a74c8
Reviewed-on: https://chromium-review.googlesource.com/287377
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>

fourier49/BIZ_EC,fourier49/BIZ_EC,fourier49/BIZ_EC,fourier49/BIZ_EC