plugin-api: deviced: Add deviced events and event name getter

plugin-api: deviced: Add deviced events and event name getter

DEVICED_EVENT_DEVICE_ATTACH
DEVICED_EVENT_DEVICE_DETACH
DEVICED_EVENT_DEVICE_READY
 : Changes of generic device

DEVICED_EVENT_POWER_SUSPEND
DEVICED_EVENT_POWER_RESUME
DEVICED_EVENT_POWER_OFF
DEVICED_EVENT_POWER_REBOOT
DEVICED_EVENT_POWER_EXIT
 : Changes of power state

DEVICED_EVENT_MISC_PROXIMITY
 : Proximity sensor

DEVICED_EVENT_MISC_GESTURE
 : Wrist up/down (to turn on/off screen, come from watch UI)

DEVICED_EVENT_MISC_PALM
 : Palm over watch face (to turn off screen, come from watch UI)

DEVICED_EVENT_MISC_ESD
 : Electrostatic discharge

Change-Id: I13e054838207c09c705249e6c93bcf4f2fcded20
Signed-off-by: Youngjae Cho <y0.cho@samsung.com>