mpm: e3xx: Simplify code referring to self.dboards

The E31x and E320 devices have one virtual daughterboard, and it is
always present. This is different from N3xx, which is where the MPM code
for these devices is based upon.

During the E3xx initialization, we make sure that our single
"daughterboard" exists and is responsive. That means we can remove some
code that tests for the availability and number of daughterboards, which
we need on N3xx (which works with zero, one, or two daughterboards).
This also allows us some minor deduplication of code.

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