[IIO] removed blocksize, merging with inner dimension

[IIO] removed blocksize, merging with inner dimension

1. Removed blocksize (merging multiple buffers of data together). Use tensor_aggregator for this functionality
2. Merging of tensors is done with innermost dimension (merging on outermost dimension introduced reduntant dimensions)
3. Bugfix:
  - buffer size scaled by buffer_capacity
  - data rate_d set to buffer_capacity
4. Moved one-shot mode todo - no support for one-shot mode now

V2:
Added direction for merging the tensor

Signed-off-by: Parichay Kapoor <pk.kapoor@samsung.com>