dax: enable dax on arm64

[ port from runtime repository commit e36389e25ea5aa778be8eb5628a3353bb13305bb ]

After backporting patch series of enabling memory hot remove on aarch64
to v5.4.x, we finally could enable nvdimm/dax on aarch64.

Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Signed-off-by: Peng Tao <bergwolf@hyper.sh>

src/runtime/virtcontainers/qemu_arm64.go

@@ -138,6 +138,7 @@ func newQemuArch(config HypervisorConfig) (qemuArch, error) {
 			kernelParamsDebug:     kernelParamsDebug,
 			kernelParams:          kernelParams,
 			disableNvdimm:         config.DisableImageNvdimm,
+			dax:                   true,
 		},
 	}