* If userspace would run
modprobe xpp_usb && cat /sys/bus/astribanks/devices/xbus-00/waitfor_xpds
it would return immediately rather than wait for the Astribank to
initialize.
* We sometimes managed to read before getting the reply from the
astribank.
* Now we don't trust unit count at such an early stage.
* Instread we wait for the Astribank to reach a stable state (READY or FAIL)
before finish waiting for this astribank.
Internal-Issue-ID: Xorcom-1502
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>