dt-bindings: fpga: altr,fpga-passive-serial: Convert to yaml

Convert the Altera Passive Serial SPI FPGA Manager binding
from text file to yaml format to allow devicetree validation.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20241003104230.1628813-1-festevam@gmail.com


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>