Properly configure pull up and pull down offsets for autocal.
Run autocal prior to every transfer.
Prevent race conditions in sdmmc_wait_for_event() - make sure the fault
handler has highest priority, then the target irq, state conditions and
finally the error mask.
Do not clear all bits (|=) when acknowledging fault conditions,
only acknowledge the fault conditions itself.
Enable interrupts before preparing command registers - if sdmmc is fast
enough it can actually finish transfer before we enabled the interrupts.
Enabling interrupts clears the COMMAND COMPLETE status bit.
Temporarily print all the sdmmc messages in stage2 - for yet unknown
reason respecting the log level results in some failures.
This results in working microsd card in stage2 on my switch with Samsung
EVO+ 256GB microsd card.
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