i2c-msm-v2: support for transfer of larger buffers

Currently the driver supports transfer of up to 256 byte
per buffer while the i2c framework supports transfer buffers
of up to 64KB. This patch allow the driver to transfer
buffers of that size.

Change-Id: I8b471f6260ec0bc940f16d22f1c787af0b70b221
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>
Signed-off-by: Ankit Gupta <ankgupta@codeaurora.org>