sh: sh7724: Drop EDMR macro

Drop the macro as it is never used and it collides with sh_eth.h macros.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

arch/sh/include/asm/cpu_sh7724.h

@@ -203,9 +203,6 @@
 #define PYDR        0xA405016A
 #define PZDR        0xA405016C
 
-/* Ether */
-#define EDMR		0xA4600000
-
 /* UBC */
 /* H-UDI */