[layer] LSTM cell batchresize bug fix

[layer] LSTM cell batchresize bug fix

As LSTM cell uses the batch values not in the batch dimension but in the
inner dimension, it creates bug with the existing layer context interface
as it only allows updating the batch along the batch dimension.
This patch provides a quick fix to combine the time and batch values in
the batch dimension.

Once recurrent realizer allows multiple inputs, the time factor will be
removed and the reshapes can be removed.

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