fsl_ifc: Fixed a bug in the erratum handling code for IFC_A003399

Wrong pointer was being used to copy code into L2SRAM.
Also removed the unreferenced variable l2srbar.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>