Increase camera IO drive strength from 2 mA to 8 mA

[Andy Green]

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Somebody in the thread at some point said:

| The camera driver reduced all IO drivers from their reset defaults of
| 6 mA to only 2 mA, which caused severe signal distortion at higher
| speeds. This patch sets them to 8 mA and also removes apparently
| useless repetitions of the setting.

How does this impact the artefacts?

- -Andy
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