tests/device-tree: Rework to account for new form of setting dtoverla…

[floion]

…y in config.txt by the supervisor

The supervisor will now write the following dtoverlay setting

"gpio-key,gpio=4,active_low=0,gpio_pull=down"

into config.txt in the following form:

dtoverlay=gpio-key dtparam=gpio=4 dtparam=active_low=0 dtparam=gpio_pull=down

So we need to rework the test to account for these changes.

Change-type: patch

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[floion]

@resin-jenkins test this please

[floion]

@balena-ci I self-certify!

[floion]

@resin-jenkins test this please