Andes custom PMU support

configname: CONFIG_ANDES_CUSTOM_PMU

Linux Kernel Configuration
└─>Device Drivers
└─>Performance monitor support
└─>Andes custom PMU support
In linux kernel since version 6.1.89 (release Date: 2024-04-29)  
The Andes cores implement the PMU overflow extension very
similar to the standard Sscofpmf and Smcntrpmf extension.

This will patch the overflow and pending CSRs and handle the
non-standard behaviour via the regular SBI PMU driver and
interface.

If you don't know what to do here, say "Y".