Revert 1.54, go back to always trying to enable burst mode

Selectively enabling burst mode seems to have broken more machines
than it helped.  On MacBooks, EC_STAT_OBF occasionally won't show up
when trying to read a byte of data when bursting hasn't been
enabled, so acpiec_wait can spin forever.

This again breaks on ECs that don't do burst at all, like the Chrome
EC, but those are much more scarce than MacBooks at this time.  A
machine/bios-dependent check could be added later to disable
bursting on certain machines.

Discussed with deraadt

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