Enable PD communication in RO for external display

This patch makes EC enable PD communication if it's running in
manual recovery mode. This is required to show recovery screen
on a type-c monitor.

This patch also makes EC-EFS ignore power availability. It will
make EC verify & jump to RW even if power is sourced by a barrel
jack adapter. This should allow depthcharge to show screens
(e.g. broken, warning) on a type-c monitor.

BUG=b:72387533
BRANCH=none
TEST=On Fizz with type-c monitor, verify
- Recovery screen is displayed in manual recovery mode.
- Critical update screen is displayed in normal mode.
- Warning screen is displayed in developer mode.
Monitors tested: Dingdong, Dell S2718D

Change-Id: Ib53e02d1e5c0f5b2d96d9a02fd33022f92e52b04
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/898346
Reviewed-by: Randall Spangler <rspangler@chromium.org>

common/usb_pd_protocol.c

@@ -27,6 +27,7 @@
 #include "usbc_ppc.h"
 #include "tcpm.h"
 #include "version.h"
+#include "vboot.h"
 
 #ifdef CONFIG_COMMON_RUNTIME
 #define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
@@ -2010,6 +2011,10 @@ static void pd_init_tasks(void)
 	/* Disable PD communication at init if we're in RO and locked. */
 	if (!system_is_in_rw() && system_is_locked())
 		enable = 0;
+#ifdef CONFIG_VBOOT_EFS
+	if (vboot_need_pd_comm())
+		enable = 1;
+#endif
 #endif
 	for (i = 0; i < CONFIG_USB_PD_PORT_COUNT; i++)
 		pd_comm_enabled[i] = enable;