feat(rdn2): introduce platform handler for Group0 interrupt

This patch introduces a handler for RDN2 platform to triage Group0
secure interrupts. Currently, it is empty but serves as a
placeholder for future Group0 interrupt sources.

Signed-off-by: Nishant Sharma <nishant.sharma@arm.com>
Change-Id: If0b64e507e9105813d9a5d16f70101cf0d8ca5a4
1 file changed