msm: vidc: Remove enabling CVP extradata by default

Remove enabling CVP metadata extradata by default, as the default
CVP-filled CVP metadata implementation is incomplete. For now,
enable CVP metadata only if client explicitly enables it.

CRs-Fixed: 2384822
Change-Id: If90cad2e74c5fb3e4be142aceb0dd2f48817cb37
Signed-off-by: Mihir Ganu <mganu@codeaurora.org>