msm: vidc: fix extradata none parsing issue

Fix an issue in extradata parsing to locate extradata_none
header when multiple extradata types are enabled by client
to avoid video usecase failure.

Change-Id: Ica24b61f24e5d7b5662fd46f2440b63f961f1516
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>