perf/imx_ddr: Dump AXI ID filter info to userspace
caps/filter indicates whether HW supports AXI ID filter or not.
caps/enhanced_filter indicates whether HW supports enhanced AXI ID filter
or not.
Users can check filter features from userspace with these attributions.
Suggested-by: Will Deacon <will@kernel.org> Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
[will: reworked cap switch to be less error-prone] Signed-off-by: Will Deacon <will@kernel.org>