gpu: nvgpu: Refacotor clk_domain Unit

As a part of refactoring this patch does the following
*Move local struct to unit specific header file
*Move nvgpu_pmu_clk_domain_freq_to_volt from clk.c to
clk_domain.c
*Move PMU specific struct to ucode_clk_inf.h
*Merge content from nvgpu/clk.h to pmu/clk/clk.h
*Update yaml file
This will help to have arch consistency across all units.

Change-Id: Ied5c6ee637e7fd5bbdee3f5bc3f6cf216454428a
Signed-off-by: Abdul Salam <absalam@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2333366
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com>
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GVS: Gerrit_Virtual_Submit
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drivers/gpu/nvgpu/os/linux/debug_clk_tu104.c

@@ -19,7 +19,6 @@
 
 #include "os_linux.h"
 
-#include <nvgpu/clk.h>
 #include <nvgpu/boardobj.h>
 #include <nvgpu/boardobjgrp_e32.h>
 #include <nvgpu/boardobjgrp_e255.h>