Set proper ATA UDMA mode for bf548 according to system clock.
UDMA Mode - Frequency compatibility UDMA5 - 100 MB/s - SCLK = 133 MHz UDMA4 - 66 MB/s - SCLK >= 80 MHz UDMA3 - 44.4 MB/s - SCLK >= 50 MHz UDMA2 - 33 MB/s - SCLK >= 40 MHz Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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