brask: configure the usb type-a port
brask: configure the usb type-a port

Set USB_PORT_COUNT to 4 to support 4 usb type-a ports.

BUG=b:191637086
BRANCH=None
TEST=make BOARD=brask

Change-Id: I5c958e04a41af99448e03d79533a847959972408
Signed-off-by: Zhuohao Lee <916bf7ddbf0565669e59e3cb2b613381a48066c0@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3114502
Reviewed-by: Boris Mittelberg <46897f4fb5cad4b1d5146ad1fd460d7f4825bbf7@google.com>

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