CHROMIUM: BACKPORT: FROMLIST: kvm: arm64: Add support for util_hint service

This service allows guests to send the utilization of workoads on its vCPUs
to the host. Utilization is represented as an arbitrary value of 0-1024
where 1024 represents the highest performance point normalized for
frequency and architecture across all CPUs. This hint is used by
the host for scheduling vCPU threads and deciding CPU frequency.

Co-developed-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: David Dai <davidai@google.com>
(am from https://patchwork.kernel.org/patch/13194984/)
(also found at https://lore.kernel.org/r/20230330224348.1006691-4-davidai@google.com

)

Conflicts:
   arch/arm64/include/uapi/asm/kvm.h
   arch/arm64/kvm/hypercalls.c
   include/linux/arm-smccc.h
   tools/arch/arm64/include/uapi/asm/kvm.h

BUG=b:249685960
TEST=Build
UPSTREAM-TASK=b:256983979

Change-Id: I7cc754ebb50ab9eae895d74e766c67537f73729f
Signed-off-by: Masami Hiramatsu <mhiramat@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4236482


Reviewed-by: Suleiman Souhlal <suleiman@chromium.org>