Optimize bilateral filter to improve speed

Optimize bilateral filter to improve speed

Optimization of bilateral filter:
1) Pre-calculate the bilateral filters at all the
levels at the initialization.
2) Convert 1D matrix to 2D matrix, avoid too many
multiplications in the bilateral filter loop.
3) Fix a bug in "loop_bilateral_filter_highbd".
The right-shifted range index can be larger than 255.

Change-Id: I42f6177e896706948e2403bd9edce46e3eb5cbf8