[ALPS08796417] Fix vdec dvfs probe v1

[Description]
Fix vdec probe to early return and vzalloc error mem

[Test]
TC30/33

MTK-Commit-Id: e9a4683cfbc828953e24f2bb47876965dc7acbf2

Signed-off-by: Mike Tsai <min-han.tsai@mediatek.com>
CR-Id: ALPS08796417
Feature: Video Driver
Change-Id: I14aebade7731a86bd1122cf2eb49a2ffa0424835