net: stmmac: remove unused definitions

net: stmmac: remove unused definitions

Potentially unused definitions were discovered using:

$ for m in $(grep '#define ' $header | sed -e 's,#define[  ]*\([^  ]*\)[   ].*,\1,;s,(.*,,'); do if ! grep -q $m *.c; then echo $m; fi; done

Each was verified, and then removed where truly unused.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1vdtwI-00000002Gu6-1HYu@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>