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/pkg/katatestutils/utils.go

@@ -28,6 +28,7 @@ type RuntimeConfigOptions struct {
 	AgentTraceType       string
 	SharedFS             string
 	VirtioFSDaemon       string
+	PFlash               []string
 	PCIeRootPort         uint32
 	DisableBlock         bool
 	EnableIOThreads      bool