acrn-config: enhance the target config

1. add misc.py to get systemd ram and root device
2. add more specify comments for arguments of functions

v1-v2:
    typo: Parser -> Parse
    some grammar check

v2-v3:
    add the message for Cx state

Tracked-On: #3602
Signed-off-by: Wei Liu <weix.w.liu@intel.com>
Acked-by: Terry Zou <terry.zou@intel.com>
Acked-by: Victor Sun <victor.sun@intel.com>

misc/acrn-config/target/misc.py

@@ -0,0 +1,50 @@
+# Copyright (C) 2019 Intel Corporation. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+import parser_lib
+
+IO_MEM_PATH = '/proc/iomem'
+
+
+def get_system_ram(config):
+    """This will get systemd ram which are usable
+    :param config: file pointer that opened for writing board config information
+    """
+    print("\t<SYSTEM_RAM_INFO>", file=config)
+    with open(IO_MEM_PATH, 'rt') as mem_info:
+
+        while True:
+            line = mem_info.readline().strip()
+            if not line:
+                break
+
+            pat_type = line.split(':')[1].strip()
+            if pat_type == "System RAM":
+                print("\t{}".format(line), file=config)
+
+    print("\t</SYSTEM_RAM_INFO>", file=config)
+    print("", file=config)
+
+
+def get_root_dev(config):
+    """This will get available root device
+    :param config: file pointer that opened for writing board config information
+    """
+    cmd = 'blkid'
+    desc = 'ROOT_DEVICE_INFO'
+    parser_lib.dump_execute(cmd, desc, config)
+    print("", file=config)
+
+
+def generate_info(board_info):
+    """Get System Ram information
+    :param board_info: this is the file which stores the hardware board information
+    """
+    with open(board_info, 'a+') as config:
+
+        get_system_ram(config)
+
+        get_root_dev(config)
+