arm64: smp: Fix trace crash with custom ipi interrupt handlers

Add NR_IPI guard around trace_ipi_raise. If a custom ipi is enabled, it
would trigger this trace event with an out of bounds array index. Other
trace_ipi_ calls are already guarded.

Bug: 156673764
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Change-Id: Ic493ef3fcfb2a38916910b6a12a7cebd05e74362