generic: 6.1: backport Qualcomm CPUFreq NVMEM changes

generic: 6.1: backport Qualcomm CPUFreq NVMEM changes

Currently, IPQ807x is using CPUFreq NVMEM for dealing with different SoC
SKU-s having different frequency limits, and we are keeping the patches
for it in ipq807x target.

However, we managed to upstream a big cleanup of the driver in order to
make it possible for other SMEM based targets to be added to CPUFreq NVMEM.

IPQ806x will be using CPUFreq NVMEM and depends on these changes as well,
so lets put them in generic backport to avoid code duplication.

This replaces the older patches in ipq807x.

Signed-off-by: Robert Marko <robimarko@gmail.com>