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Detail:
The interrupt_semaphore is now atomically set, and is
atomically cleared before the interrupt routine thread runs.
This ensures that any subsequent SDIO Card Interupts will be
caught rather than potentially ignored if they occur while
the interrupt thread is running..

Global CCCR enable is set automatically when any other bits in the
CCCR are enabled, otherwise it is cleared. (within the sdmmc intr_enable
and intr_disable routines). This was already done in the sdio_io
equivalent routines.

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