libvideorender: CB2 refine post buffer time [1/1]

PD#SWPL-182760

Problem:
usleep 4 ms when post buffer to weston

Solution:
1.calculate wait time by display time and now time
2.set waylandProtocolThread priority to 60
3.set waylandPostBufferThread priority to 45

Verify:
ap222

Change-Id: I52fcaee28085839e4c9e4684aeaf24991c9fc690
Signed-off-by: fei.deng <fei.deng@amlogic.com>
7 files changed