arm64: enable acpi for qemu/virt.

acpi is enabled for kata 1.x, port and rebase code for 2.x
including:
runtime: enable pflash;
agent: add acpi support for pci bus path;
packaging: enable CONFIG_RTC_DRV_EFI;

Fixes: #1317
Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>

src/runtime/virtcontainers/qemu_arch_base.go

@@ -119,6 +119,12 @@ type qemuArch interface {
 	// addBridge adds a new Bridge to the list of Bridges
 	addBridge(types.Bridge)
 
+	// getPFlash() get pflash from configuration
+	getPFlash() ([]string, error)
+
+	// setPFlash() grants access to pflash
+	setPFlash([]string)
+
 	// handleImagePath handles the Hypervisor Config image path
 	handleImagePath(config HypervisorConfig)
 
@@ -151,6 +157,7 @@ type qemuArchBase struct {
 	kernelParamsDebug    []Param
 	kernelParams         []Param
 	Bridges              []types.Bridge
+	PFlash		     []string
 }
 
 const (
@@ -798,3 +805,11 @@ func (q *qemuArchBase) appendPVPanicDevice(devices []govmmQemu.Device) ([]govmmQ
 	devices = append(devices, govmmQemu.PVPanicDevice{NoShutdown: true})
 	return devices, nil
 }
+
+func (q *qemuArchBase) getPFlash() ([]string, error) {
+	return q.PFlash, nil
+}
+
+func (q *qemuArchBase) setPFlash(p []string) {
+	q.PFlash = p
+}