Fireface 400 is a second model of RME Fireface series, released in 2006.
This commit adds support for this model.

This model supports 8 analog channels, 2 S/PDIF channels and 8 ADAT
channels in both of tx/rx packet. The number of ADAT channels differs
depending on each mode of sampling transmission frequency.

$ python2 linux-firewire-utils/src/crpp < /sys/bus/firewire/devices/fw1/config_rom
               ROM header and bus information block
               -----------------------------------------------------------------
400  04107768  bus_info_length 4, crc_length 16, crc 30568 (should be 61311)
404  31333934  bus_name "1394"
408  20009002  irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 0, max_rec 9 (1024)
40c  000a3501  company_id 000a35     |
410  1bd0862a  device_id 011bd0862a  | EUI-64 000a35011bd0862a

               root directory
               -----------------------------------------------------------------
414  000485ec  directory_length 4, crc 34284
418  03000a35  vendor
41c  0c0083c0  node capabilities per IEEE 1394
420  8d000006  --> eui-64 leaf at 438
424  d1000001  --> unit directory at 428

               unit directory at 428
               -----------------------------------------------------------------
428  000314c4  directory_length 3, crc 5316
42c  12000a35  specifier id
430  13000002  version
434  17101800  model

               eui-64 leaf at 438
               -----------------------------------------------------------------
438  000261a8  leaf_length 2, crc 25000
43c  000a3501  company_id 000a35     |
440  1bd0862a  device_id 011bd0862a  | EUI-64 000a35011bd0862a
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>