net: fec: better indexing for transmit descriptor ring

Maintaining the transmit ring position via pointers is inefficient,
especially when it involves complex pointer manipulation, and overlap
with the receive descriptor logic.

Re-implement this using indexes, and a single function which returns
the descriptor (appropriate to the descriptor type).  As an additional
benefit, using a union allows cleaner access to the descriptor.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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