Fix possible race with head of tx ring

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Extend module parameter desc of SPI clock speed

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Make pluggable a module parameter and remove it as DT property

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Split module parameter error handling

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Bump qcaspi version

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>