FROMGIT: usb: typec: tcpm: Disregard vbus off while in PR_SWAP_SNK_SRC_SOURCE_ON

During PR_SWAP sequence, when TCPM is waiting in PR_SWAP_SNK_SRC_SOURCE_ON
for the vbus source to ramp up, TCPM would prematurely exit
PR_SWAP_SNK_SRC_SOURCE_ON and transition to SNK_UNATTACHED state when a
vbus off notification is received. This should not be the case as vbus
can still be off while in PR_SWAP_SNK_SRC_SOURCE_ON and the vbus source
has PD_T_NEWSRC to ramp up.

Bug: 168555244
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20201125020703.1604979-1-badhri@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 3f461fba1f8f07d1a93c6489136b44c7300bb016
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git

 usb-next)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I598c75bcca2d2b878897036f8a8dd6a1fc1d6fa3