vdec: avoid decoder run and work executing at the same time [1/1]

vdec: avoid decoder run and work executing at the same time [1/1]

PD#SWPL-26671

Problem:
decoder run and work executing at same time will causes race conditions

Solution:
avoid decoder run and work executing at the same time

Verify:
u212

Change-Id: I9e16c7cebc6fb7d0bc36f749d7bc430c515e6c6a
Signed-off-by: apollo.ling <apollo.ling@amlogic.com>