gpu: nvgpu: fix sparse warning in LTC code

bug 200088648

sparse warning reported that the function was not
defined. This was due to a missing include

Change-Id: Ia6153a2f3348a86e78add95bcfff998505b47cdd
Signed-off-by: David Nieto <dmartineznie@nvidia.com>
Reviewed-on: http://git-master/r/1237845
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

drivers/gpu/nvgpu/gp106/ltc_gp106.c

@@ -16,6 +16,7 @@
 #include "gk20a/gk20a.h"
 #include "gm20b/ltc_gm20b.h"
 #include "gp10b/ltc_gp10b.h"
+#include "gp106/ltc_gp106.h"
 
 void gp106_init_ltc(struct gpu_ops *gops)
 {