remoteproc: tz_pil: make irqs, smd edge & crash-reason optional properties

the wdog, fatal, ready, handover and stop-ack irqs does not
exist for vidc (venus) remote processor, so make them optional.

Also crash-reason id and smd edge ditto.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>