conf/cards: add support for pistachio-card.

The data sheet of the chip and technical reference manual can be found at https://docs.creatordev.io/ci40/guides/hardwaredocs/cXT200_datasheet2.pdf
and https://docs.creatordev.io/ci40/guides/hardwaredocs/MIPS_Creator_cXT200_Technical_Reference_Manual_1.0.112.pdf

.

The additional information about the cards can be found in src/conf/cards/pistachio-card.conf file.

Signed-off-by: Manohar Narkhede <Manohar.Narkhede@imgtec.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>