pd: set BMC bit
pd: set BMC bit

In the current version of USB-PD standard, the packet header should have bit 15
set to 1 to tell the other side that we are supporting Biphase Mark Coding
(aka BMC).

For now, just set it, do not check it as most of our devices are setting it
yet.

Signed-off-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

BRANCH=none
BUG=none
TEST=make buildall

Change-Id: Ia6f89f592632520b46478a7d7975e9e8d3a28b59
Reviewed-on: https://chromium-review.googlesource.com/202391
Reviewed-by: Alec Berg <1a4429eeda29095a12e19a73405f80f5b7f37a63@chromium.org>
Commit-Queue: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>
Tested-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

akappy7/ChromeOS_EC_LED_Diagnostics,longsleep/ec,coreboot/chrome-ec,coreboot/chrome-ec,longsleep/ec,akappy7/ChromeOS_EC_LED_Diagnostics,coreboot/chrome-ec,alterapraxisptyltd/chromium-ec,mtk09422/chromiumos-platform-ec,thehobn/ec,md5555/ec,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,eatbyte/chromium-ec,thehobn/ec,mtk09422/chromiumos-platform-ec,fourier49/BIZ_EC,fourier49/BIZ_EC,eatbyte/chromium-ec,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,thehobn/ec,alterapraxisptyltd/chromium-ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,md5555/ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC,alterapraxisptyltd/chromium-ec,mtk09422/chromiumos-platform-ec,alterapraxisptyltd/chromium-ec,mtk09422/chromiumos-platform-ec,eatbyte/chromium-ec,thehobn/ec,fourier49/BZ_DEV_EC,coreboot/chrome-ec,longsleep/ec,fourier49/BIZ_EC,md5555/ec,fourier49/BZ_DEV_EC,longsleep/ec,eatbyte/chromium-ec