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

This service allows guests to query the host for frequency of the CPU
that the vCPU is currently running on.

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/13194986/)
(also found at https://lore.kernel.org/r/20230330224348.1006691-3-davidai@google.com

)

Conflicts:
   Documentation/virt/kvm/api.rst
   arch/arm64/include/uapi/asm/kvm.h
   arch/arm64/kvm/arm.c
   arch/arm64/kvm/hypercalls.c
   include/uapi/linux/kvm.h
   tools/arch/arm64/include/uapi/asm/kvm.h

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

Change-Id: I78caad7acc5d2e01b18997d04d33bdaf73102535
Signed-off-by: Masami Hiramatsu <mhiramat@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4236481


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