sif: eq: Avoid enabling interrupts on TSU EQs until the initialization is complete

sif: eq: Avoid enabling interrupts on TSU EQs until the initialization is complete

During driver load we might have some rare conditions where external events
are occuring before the driver is ready to accept them. The hardware workarounds
to handle issues with QP flushing are particularly sensitive to this.

Delay enabling of the IRQs that can generate interrupts for all
event queues except the EPS event queue(s) until everything is set up and ready.

Note that this commit will also implicitly cause interrupts for EQs 1-3 for each EPSA
not to be enabled. This is no big deal as they are currently not used anyway.

Orabug: 24296729

Signed-off-by: Knut Omang <knut.omang@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>