Add delay for power supply startup time before sending source
capabilities packets.
BUG=none
BRANCH=samus
TEST=load on samus, plug in C to A receptacle adapter, see that
VBUS enabled before source cap packet sent.
Change-Id: If3b595e1671d089e859693b420841a639fdb146b
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/227423