nvgpu: nvgpu: Fix for signal handler

The function BUG() will be called for any error conditions in qnx.
As we need to stop the gpu from further processing, signal need to
be raised.

Change-Id: I99034a4ac772f898f9eec7b324512fb1419fcce6
Signed-off-by: dinesh <dt@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2243314
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Reviewed-by: Shashank Singh <shashsingh@nvidia.com>
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Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
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drivers/gpu/nvgpu/os/posix/bug.c

@@ -94,9 +94,7 @@ void nvgpu_posix_bug(const char *fmt, ...)
 	 */
 	nvgpu_err(NULL, "BUG detected!");
 	dump_stack();
-#ifdef __NVGPU_UNIT_TEST__
 	(void) raise(SIGSEGV);
-#endif
 	pthread_exit(NULL);
 }