Some platform attributes (e.g. max_hz, use_dma) were being intuited
from the modem type. These things should be specified by the platform
data.

Added max_hz, use_dma to ifx_modem_platform_data definition,
replaced is_6160 w/ modem_type, and changed clients accordingly
Signed-off-by: NRuss Gorby <russ.gorby@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Prototype driver for the IFX6x60 series of SPI attached modems by Jim
Stanley and Russ Gorby
Signed-off-by: NRuss Gorby <richardx.r.gorby@intel.com>

[Some reworking and a major cleanup]
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>