gpu: nvgpu: remove clk_arb.h to gk20a.h circular dependency

clk_arb.h and gk20a.h has circular dependencies to each other. This is
removed by forward declaring struct gk20a in clk_arb.h and removing the
header gk20a.h from clk_arb.h and similarly forward declaring struct
nvgpu_clk_arb in gk20a.h and removing the header clk_arb.h from gk20a.h
alongwith putting headers in every execution unit which calls clk_arb.h
related methods.

JIRA NVGPU-597

Change-Id: I7cedca17206c148b21d93e5d7f0d88c2f98b979a
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1790915
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/os/linux/ioctl_ctrl.c

@@ -29,6 +29,8 @@
 #include <nvgpu/log.h>
 #include <nvgpu/enabled.h>
 #include <nvgpu/sizes.h>
+#include <nvgpu/list.h>
+#include <nvgpu/clk_arb.h>
 
 #include "ioctl_ctrl.h"
 #include "ioctl_dbg.h"

drivers/gpu/nvgpu/os/linux/module.c

@@ -42,6 +42,7 @@
 #include <nvgpu/ctxsw_trace.h>
 #include <nvgpu/vidmem.h>
 #include <nvgpu/sim.h>
+#include <nvgpu/clk_arb.h>
 
 #include "platform_gk20a.h"
 #include "sysfs.h"