ENGR00172374-2: pfuze: use pdata_size from mfd_cell struct

ENGR00172374-2: pfuze: use pdata_size from mfd_cell struct

fix the building errors when upgrade to v3.0

we use data_size from mfd_cell struct on 2.6.38, but after that
there are some changes for this field of mfd_cell struct, see:

commit 40e03f571b2e63827f2afb90ea9aa459612c29e3
Author: Andres Salomon <dilinger@queued.net>
Date:   Thu Feb 17 19:07:24 2011 -0800

    mfd: Drop data_size from mfd_cell struct

    Now that there are no more users of this, drop it.

    Signed-off-by: Andres Salomon <dilinger@queued.net>
    Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
and this:

commit eb8956074e7652e802be5f078080c704c2c87104
Author: Samuel Ortiz <sameo@linux.intel.com>
Date:   Wed Apr 6 16:52:52 2011 +0200

    mfd: Add platform data pointer back

    Now that we have a way to pass MFD cells down to the sub drivers,
    we can gradually get rid of mfd_data by putting the platform pointer
    back in place.

    Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
But the above commit also change the name from data_size to pdata_size,
This patch just give one fix for the pfuze driver to use pdata_size field.

Signed-off-by: Jason Liu <r64343@freescale.com>