plugin-api: deviced: Add skeleton header for power module

plugin-api: deviced: Add skeleton header for power module

syscommon-plugin-deviced-common-interface.h
 - Define common types and macros that can be commonly utilized over
   the whole modules, by both core and plugin.
 - Added enum deviced_resource_type so that all modules can share the
   enum. This is because the enum must be unique for each module.

syscommon-plugin-deviced-power.h
 - Contain plugin-api functions that invoking plugin functions
   from the deviced core.

syscommon-plugin-deviced-power-interface.h
 - Contain types and macros that can be utilized by both core and
   plugin.

Change-Id: Iab8bc083a3610b720222df284f880d961fb75188
Signed-off-by: Youngjae Cho <y0.cho@samsung.com>