octopus: reduce USB-C source current to 1.5A
octopus: reduce USB-C source current to 1.5A

octopus hardware does not support sourcing 3A over USB-C and 1.5A over
USB-A at the same time for any daughter board. Reduce what we
advertise to 1.5A.

BRANCH=none
BUG=b:139110010,b:139201733
TEST=connect a sink device with a pd analyzer to see if source
capabilities is 5V/1.5A

Change-Id: Idad7a11b28cefda1aabbca540864a6248d826a47
Signed-off-by: Jett Rink <9d4aef0593e6843318d99df31597fb6153b89787@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1741597
Reviewed-by: Edward Hill <db1406b34e091703092b6b136bdfeb2c8125fc0e@chromium.org>

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