linux_spi: Hardcode default spispeed of 2MHz

Leaving the `linux_spi` driver's unknown default is almost never what we
want and resulted in many support requests since Raspbian switched to a
default that is too high for most applications.

Change-Id: I9361b7c1a1ab8900a619b06e1dae14cd87eb56c2
Signed-off-by: Nico Huber <>
Tested-by: build bot (Jenkins) <>
Reviewed-by: Arthur Heymans <>
1 file changed