platform: tegra: rtcpu: Combine drivers

The RTCPU driver has a dependency of the following kernel modules:

 clk-group
 device-group
 reset-group

Rather that builds all these source files as individual drivers, which
is bloating the number of kernel modules required, compile these source
files into the main RTCPU kernel module.

Finally, remove any unneeded header files from the ivc-bus driver.

Bug 4078936

Change-Id: I0981a716db7a91556d8c00a291b81dec01dda2e3
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2890896
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Matti Ryttylainen <mryttylainen@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

drivers/platform/tegra/rtcpu/Makefile

@@ -12,10 +12,13 @@ obj-m += ivc-bus.o
 obj-m += camchar.o
 obj-m += camera-diagnostics.o
 obj-m += rtcpu-debug.o
-obj-m += clk-group.o
 obj-m += hsp-mailbox-client.o
-obj-m += reset-group.o
-obj-m += device-group.o
 
-tegra-camera-rtcpu-objs :=  tegra-camera-rtcpu-base.o tegra-rtcpu-trace.o rtcpu-monitor.o
+tegra-camera-rtcpu-objs := clk-group.o \
+			   device-group.o \
+			   reset-group.o \
+			   rtcpu-monitor.o \
+	                   tegra-camera-rtcpu-base.o \
+			   tegra-rtcpu-trace.o
+
 obj-m += tegra-camera-rtcpu.o

drivers/platform/tegra/rtcpu/ivc-bus.c

@@ -9,11 +9,9 @@
 #include <linux/slab.h>
 #include <soc/tegra/ivc_ext.h>
 #include <linux/tegra-ivc-bus.h>
-#include <linux/tegra-camera-rtcpu.h>
 #include <linux/bitops.h>
 #include <linux/version.h>
 #include "soc/tegra/camrtc-channels.h"
-#include "soc/tegra/camrtc-commands.h"
 
 #define NV(p) "nvidia," #p