devices: implement Aml trait for GED device

Fixes: #657

Signed-off-by: Qiu Wenbo <qiuwenbo@phytium.com.cn>

devices/Cargo.toml

@@ -10,6 +10,7 @@ epoll = ">=4.0.1"
 libc = "0.2.67"
 log = "0.4.8"
 vm-device = { path = "../vm-device" }
+acpi_tables = { path = "../acpi_tables", optional = true }
 vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
 vmm-sys-util = ">=0.3.1"
 
@@ -18,5 +19,5 @@ tempfile = "3.1.0"
 
 [features]
 default = []
-acpi = []
+acpi = ["acpi_tables"]
 cmos = []