hv: add max payload to vrp

It seems important that passthru device's max payload settings match
the settings on the native device otherwise passthru device may not work.
So we have to set vrp's max payload capacity as native root port
otherwise we may accidentally change passthru device's max payload
since during guest OS's pci device enumeration, pass-thru device will
renegotiate its max payload's setting with vrp.

Tracked-On: #5915

Signed-off-by: Rong Liu <rong.l.liu@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>

hypervisor/include/public/acrn_common.h

@@ -672,6 +672,7 @@ struct acrn_intr_monitor {
 struct vrp_config
 {
 	uint16_t phy_bdf;
+	uint8_t max_payload; /* dev cap's max payload */
 	uint8_t primary_bus;
 	uint8_t secondary_bus;
 	uint8_t subordinate_bus;