soc: qcom: qsee_ipc_irq_bridge: Remove extra level irq handling

Clearing the level triggered interrupt should be handled by the
qsee_ipc_irq driver. Remove the extra code for detecting and handling
level triggered irqs.

Change-Id: Ic6a3c776976dd26e44f8979f4237e90466aa7888
Signed-off-by: Chris Lew <clew@codeaurora.org>