soc: qcom: qsee_ipc_irq_bridge: Remove redundant cleanup

qiib_cleanup in qiib_driver_data_deinit is redundant since
this cleanup is already done in driver remove.

Remove qiib_cleanup in deinit and add required NULL check to
avoid any use-after-free scenario.

Change-Id: I95fa3cf91b5ca6cbaeb66d304a0572ba1d294a69
Signed-off-by: Sarannya S <quic_sarannya@quicinc.com>