dt-bindings: power: reset: xilinx: Make "interrupts" property optional

dt-bindings: power: reset: xilinx: Make "interrupts" property optional

The "interrupts" property in the ZynqMP power/reset binding was previously
marked as required. However, there are multiple mechanisms for
handling power/reset events, including:
-Event management registration,
-Mailbox (mboxes),
-Interrupts (interrupts).

When event management support is available (default on Versal SoC), the
"interrupts" property is not used hence not required.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20250217095226.12606-1-shubhrajyoti.datta@amd.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>