mei: bus-fixup: change pxp mode only if message was sent

Move PXP mode state machine to SETUP mode only if
memory ready message sent successfully to the firmware.
Leave it in INIT mode otherwise to allow try to send message later.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Link: https://lore.kernel.org/r/20221116124735.2493847-3-alexander.usyskin@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>