at91_emac.h: fix typo in register definition

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Acked-by: Jens Scharsig <js_at_ng@scharsoft.de>

arch/arm/include/asm/arch-at91/at91_emac.h

@@ -61,7 +61,7 @@ typedef struct at91_emac {
 	u32	 reserved2[3];
 	u32	 hsh;
 	u32	 hsl;
-	u32	 sh1l;
+	u32	 sa1l;
 	u32	 sa1h;
 	u32	 sa2l;
 	u32	 sa2h;