arm64: dts: ti: k3-am65-main: Fix gic-its node unit-address

The gic-its node unit-address has an additional zero compared
to the actual reg value. Fix it.

Fixes: ea47eed3 ("arm64: dts: ti: Add Support for AM654 SoC")
Reported-by: Robert Tivy <rtivy@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>