gpu: nvgpu: remove rcu locks in clk arbiter

RCU's are available only in (linux) kernel. Though they are
able to achieve lockless access in some specific scenarios,
they are heavily dependent on the kernel for their functionality.
E.g. synchronize_rcu(), which depends on the kernel in order to
delimit read side critical sections.

As such it is very difficult to implement constructs analogous
to RCUs in userspace code. As a result the code which depends on
RCU's for synchronization is not portable between OS'es,
especially if one of them is in userspace, viz. QNX.

Also, if the code is not in performance critical path, we can do
with non-RCU constructs.

For clk arbiter code here, RCU's are replaced by the traditional
spinlocks, so that the code could be used by QNX down the line.

Jira VQRM-3741

Change-Id: I178e5958788c8fd998303a6a94d8f2f328201508
Signed-off-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1705535
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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