libhwc2.1: Modify concept of display's type and ID

Bug: 162322019
Test: single/dual display boot to OS, and suspend/resume
Change-Id: Iebac9728b274eef0b3291fd4505edfe8ec51ca97
Signed-off-by: Seungchul Kim <sc377.kim@samsung.com>
Signed-off-by: HyunKyung Kim <hk310.kim@samsung.com>
6 files changed