Expose the sysfs interface to userspace tools for power monitoring. Useful for tracking energy usage in CPU package, cores, DRAM, etc. Build system: x86/64 Build-tested: x86/64 Run-tested: x86/64 Signed-off-by: John Audia <therealgraysky@proton.me> Link: https://github.com/openwrt/openwrt/pull/18255 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>