kernel-resin.bbclass: Disable in-tree rtl8192cu driver

[floion]

We will only have the out of tree module which allegedly
is more stable:
raspberrypi/linux#1866

The configs for disabling it were added but apparently
they were never applied.

Change-type: patch
Changelog-entry: Disable in-tree rtl8192cu driver
Signed-off-by: Florin Sarbu florin@balena.io

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[floion]

@resin-jenkins retest

[floion]

@resin-jenkins test this please