usb: pd: Clear send_get_status flag in protocol reset

Consider a scenario where a connected PD partner has sent an
alert message to the device and driver marked send_get_status
to true and queued usbpd_sm work with a delay of 150ms. Now,
if the cable gets disconnected before the start of usbpd_sm
work then send_get_status flag will not get cleared anywhere.
On the next cable plug-in, in PE_SNK_READY driver will
unnecessarily send Get_Status again which is incorrect and
may lead to soft/hard reset causing the PD partner to disconnect.
Fix this by clearing the send_get_status flag in the protocol reset.

Change-Id: I4747b0a25a0870e83ff78e0b9ccd7e3fd91ed9e6
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>