STM32 SDIO DMA:  Ignore DMA FIFO errors; these seem to be bogus. SD multiple block transfers result in CRC errors; avoid them by using smaller FTP buffer sizes

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4410 42af7a65-404d-4744-a932-0658087f49c3