gpu: nvgpu: compile nvgpu allocator for QNX

The patch has the changes for compilation of
common nvgpu allocator for QNX.
This includes some cross-OS compilation changes
and removing some Linux'isms from the allocator.

Change-Id: Ib1ecceec77b497513a196597bff4441615577548
Signed-off-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1540306
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

drivers/gpu/nvgpu/include/nvgpu/allocator.h

@@ -35,6 +35,7 @@
 #include <nvgpu/log.h>
 #include <nvgpu/lock.h>
 #include <nvgpu/list.h>
+#include <nvgpu/types.h>
 
 /* #define ALLOCATOR_DEBUG */