USB-PD: SOP'/SOP" packet header field
USB-PD: SOP'/SOP" packet header field

SOP'/SOP" message header bit field:
bit5:should reserved
bit8:0b Message originated from a DFP or UFP
     1b Message originated from a Cable Plug.

reference: PD3.0 v2.0 spec table 6-1 message header.

BUG=None
BRANCH=None
TEST=test on baord: reef_it8320
     SRC connects to SNK via E-mark cable, sources Vconn successfully,
     check SOP' header bit field by Lecroy analyzer.

Change-Id: Ie9b9d8507d84d5b4c694cc906eb7da8715b88a5f
Signed-off-by: Ruibin Chang <6748d95250dd3d29f04d200035d5434f3b7820ef@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1725379
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

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