video: tegra: host: Remove error case panics

Remove BUG_ON()s in error cases:
* If IOCTL size is too large, return error instead
* If sync point id is out of range, return error. Prevents panics in
  sanity checks nvhost_cdma.

Bug 993642

Change-Id: I3cfa7a23dc557c811e20b726885f82666437de7f
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/106232
Reviewed-by: Prajakta Gudadhe <pgudadhe@nvidia.com>
Tested-by: Prajakta Gudadhe <pgudadhe@nvidia.com>
smba1002: bumped harmony i2c back to 100000