[ALSA] ASoC AT91xxxx eti B1 machine SSC changes

This patch by Frank Madarino updates the eti B1 machine to use the newer
AT91xxxx SSC core with the DSP/PCM audio hardware changes.
Changes:-
 o #include 'at91-ssc.h' instead of 'at91-i2s.h'
 o Rename various I2S labels to SSC

Signed-off-by: Frank Mandarino <fmandarino@endrelia.com>
Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>