vlock: add phase lock pll mode [1/1]

vlock: add phase lock pll mode [1/1]

PD#SWPL-6899

Problem:
enable vlock phase lock function in pll mode

Solution:
1.when phase lock on, and when phase lock flag not assert
disable ss.
2.after phase lock flag assert, restore ss

Verify:
tl1

Change-Id: I2f9f6ec76468b1043c1b7ec99b2daa4f9d69ae60
Signed-off-by: Yong Qin <yong.qin@amlogic.com>