volteer: Enable PLATFORM_EC_USB_PD_ALT_MODE_UFP
volteer: Enable PLATFORM_EC_USB_PD_ALT_MODE_UFP

This is needed to enable the power-delivery task since the option is not
enabled by default.

BUG=b:175434113
TEST=make BOARD=volteer -j30
build volteer on zephyr

Signed-off-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
Cq-Depend: chromium:2617204
Change-Id: I3f3c9c76828cc3bef3303126c7c42f052c954a4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/zephyr-chrome/+/2623427
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2630177
Tested-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>
Commit-Queue: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>

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