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/arch/x86/asm/vm_config.h

@@ -154,6 +154,7 @@ struct acrn_vm_pci_dev_config {
 	struct target_vuart t_vuart;
 	uint16_t vuart_idx;
 	uint16_t vrp_sec_bus;			/* use virtual root port's secondary bus as unique identification */
+	uint8_t vrp_max_payload;		/* vrp's dev cap's max payload */
 	uint64_t vbar_base[PCI_BAR_COUNT];		/* vbar base address of PCI device, which is power-on default value */
 	struct pci_pdev *pdev;				/* the physical PCI device if it's a PT device */
 	const struct pci_vdev_ops *vdev_ops;		/* operations for PCI CFG read/write */