Revert "kmssink: change hold buffer number to 3"

This reverts commit ba15e45751e03ce16617af2249b6850e39326225.

this commit was a work around that fix video jitter when enable
DTRC. Test the latest kernel, without the commit, video playback
is ok when enable DTRC

Conflicts:
	sys/kms/gstkmssink.h
1 file changed