freescale: Move the Freescale drivers

Move the Freescale drivers into drivers/net/ethernet/freescale/ and
make the necessary Kconfig and Makefile changes.

CC: Sandeep Gopalpet <sandeep.kumar@freescale.com>
CC: Andy Fleming <afleming@freescale.com>
CC: Shlomi Gridish <gridish@freescale.com>
CC: Li Yang <leoli@freescale.com>
CC: Pantelis Antoniou <pantelis.antoniou@gmail.com>
CC: Vitaly Bordug <vbordug@ru.mvista.com>
CC: Dan Malek <dmalek@jlc.net>
CC: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>