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Uclamp is upstream since kernel 5.4. Add support to use the same.  If
the interface is not available, it is ignored so as to keep old kernels
working.

Note that uclamp is the replacement to the out-of-kernel-tree schedtune. This
interface improves performance of urgent tasks such as (display and audio) by
making them prefer idle CPUs.

A small portion of the uclamp kernel support is not upstream which is uploaded at:
https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2241891

Bug: 1041117
Change-Id: I0f2d89a9cbe4cdb53a8f1105b6b5a29cdd6fde4a
Signed-off-by: Joel Fernandes <joelaf@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207962Reviewed-by: Darin Fisher <darin@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806060}