xilinx_sdfec: Convert to IDA

This driver does not use the lookup abilities of the IDR, so convert it
to the more space-efficient IDA.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20190807025050.28367-1-willy@infradead.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>