accel/ivpu: Clear CDTAB entry in case of failure

accel/ivpu: Clear CDTAB entry in case of failure

Don't leave a context descriptor in case CFGI_ALL flush fails.
Mark it as invalid (by clearing valid bit) so nothing is left in
partially-initialized state.

Signed-off-by: Karol Wachowski <karol.wachowski@intel.com>
Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241017145817.121590-5-jacek.lawrynowicz@linux.intel.com