gpu: nvgpu: add missing timer includes

Many files used declarations from timers.h implicitly via another header
file(s). Add several #includes explicitly to their users.

Jira NVGPU-967

Change-Id: I88b515061db87c69bd85e3655b74d0271a80d9bf
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1804611
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/fb/fb_gm20b.c

@@ -31,6 +31,7 @@
 #include "fb_gm20b.h"
 
 #include <nvgpu/io.h>
+#include <nvgpu/timers.h>
 
 #include <nvgpu/hw/gm20b/hw_fb_gm20b.h>
 #include <nvgpu/hw/gm20b/hw_gmmu_gm20b.h>

drivers/gpu/nvgpu/common/fb/fb_gp106.c

@@ -26,6 +26,7 @@
 #include "fb_gp106.h"
 
 #include <nvgpu/io.h>
+#include <nvgpu/timers.h>
 
 #include <nvgpu/hw/gp106/hw_fb_gp106.h>
 

drivers/gpu/nvgpu/common/fb/fb_gv100.c

@@ -37,6 +37,7 @@
 #include <nvgpu/falcon.h>
 #include <nvgpu/io.h>
 #include <nvgpu/utils.h>
+#include <nvgpu/timers.h>
 
 #include "gk20a/gk20a.h"
 #include "gm20b/acr_gm20b.h"

drivers/gpu/nvgpu/common/fb/fb_gv11b.c

@@ -32,6 +32,7 @@
 #include <nvgpu/ptimer.h>
 #include <nvgpu/io.h>
 #include <nvgpu/utils.h>
+#include <nvgpu/timers.h>
 
 #include "gk20a/gk20a.h"
 #include "gk20a/mm_gk20a.h"