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>
