Cuda for Jeston TX2

[AnnaRomanov]

Initial CUDA support for conversions and pointcloud generation.

Performance improvement:

As tested on the Jetson TX2:

Description	Resoultion	fps	No Cuda, avg. (ms)	With Cuda, avg. (ms)
YUY2 into RGB8	1920x1080	30	30 - 32	5-7
YUY2 into RGBA8	1920x1080	30	34	7.5
YUY2 into BGR8	1920x1080	30	35	5 - 7
YUY2 into BGRA8	1920x1080	30	37	7 - 10
YUY2 into Y16	1920x1080	30	10	5 - 8
Splitting Y8I to Y8, Y8	1280x800	30	9 - 10	3 - 5
Splitting Y12 to Y16, Y16	1280x800	25	22.9	5 - 7
Pointcloud (deproject depth)	640x480	30	8 - 9	3 - 5

In order to activate GPU full power run: sudo ./jetson_clocks.sh

Acknowledgements:

• cuda_conversion.cuh and cuda_conversion.cu is partly based on Mehran Maghoumi's work: https://github.com/Maghoumi/culibrealsense

• Patches for Jetson TX2 in src/linux/backend-hid.cpp and src/linux/backend-v4l2.cpp were added as suggested by JetsonHacks in the following repository: https://github.com/jetsonhacks/buildLibrealsense2TX

Related issue: #1861

[zivsha]

Will it be possible to "BUILD_WITH_CUDE" on a PC with Nvidia card (i.e not on a Jetson)?