HW simplifications for intra predicition.
Changed from 256 points interpolation to 32 points.
Changed values in dr_intra_derivative to be upscaled by 64
instead of 256 and adjusted the angles to be more evenly
spread out. Values are also kept within 10-bits.

AWCY results:
objective-1-fast-1, key-frame only, cpu-used=0
--disable-ext-partition --disable-ext-partition-types
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0476 |     N/A |  0.2705 |  -0.0741 | -0.1357 | -0.1960 |        N/A

Change-Id: I1e1712ab71dc47a3e898b1799ba9e648153735eb