clearfog: kernel: rework spidev handling for OCM

This is all about how to get spidev to export a SPI device to userspace.
We switched to a udev-style control last fall, but one upstream patch
which was supposed to provide auto-driver-bind in response to a udev
rule which sets the `driver_override` attribute has not been merged yet.
See [1] for reasons why it might not get merged, ever.

Adjust the userspace to bind a driver from within udev.

[1] https://www.spinics.net/lists/linux-spi/msg16384.html

Change-Id: I26f839ece7881baf56b8f0705623024e117a3a02
diff --git a/board/czechlight/clearfog/linux.fragment b/board/czechlight/clearfog/linux.fragment
index f2249a3..2da25d2 100644
--- a/board/czechlight/clearfog/linux.fragment
+++ b/board/czechlight/clearfog/linux.fragment
@@ -39,3 +39,5 @@
 CONFIG_MV643XX_ETH=n
 CONFIG_KEYBOARD_ATKBD=N
 CONFIG_INPUT_MOUSE=N
+
+CONFIG_LOCALVERSION="-9-g0cd0cb35cf72"