bcm2835_sdhci.c: exit DMA if not enough data left to avoid timeout errors

[bz]

Summary

In the DMA case, given we disable the data interrupts, we never seem
to get DATA_END.  Given we are relying on DMA interrupts we are not
using the SDHCI state machine and hence only call into
sdhci_platform_will_handle() for the first check of data.
We do not call "will handle" for any following round trips of the same
transaction if block size * count > BCM_DMA_BLOCK_SIZE.
Manually check "left" in the DMA interrupt handler to see if we have at
least another full BCM_DMA_BLOCK_SIZE to handle.
Without this change we would DMA that and then even start a DMA with
left == 0 which would lead to a timeout and error.
Now we re-enable data interrupts and return and let the SDHCI generic
interrupt handler and state machine pick the SPACE_AVAIL up and then
find that it should punt to the pio_handler for the remaining bytes
or finish the data transaction.

With this change block mode seems to work beyond 7 * 64byte blocks
(my initial test case) which worked as it was below BCM_DMA_BLOCK_SIZE.

Test Plan

Tested a few sizes up to 511 blocks of 64bytes.
Especially tested 16 blocks which leads to 2 * BCM_DMA_BLOCK_SIZE and a straight left == 0.

[bz]

I'd like to commit this the next days. Can someone please review? If not it'll go in by Sat 8 June.