net: zynq: Remove unused MDCCLKDIV2 macro

Driver cleanup.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c
index 9d69c84..4db3ed4 100644
--- a/drivers/net/zynq_gem.c
+++ b/drivers/net/zynq_gem.c
@@ -59,7 +59,6 @@
 #define ZYNQ_GEM_NWCFG_FDEN		0x000000002 /* Full Duplex mode */
 #define ZYNQ_GEM_NWCFG_FSREM		0x000020000 /* FCS removal */
 #define ZYNQ_GEM_NWCFG_MDCCLKDIV	0x000080000 /* Div pclk by 32, 80MHz */
-#define ZYNQ_GEM_NWCFG_MDCCLKDIV2	0x0000c0000 /* Div pclk by 48, 120MHz */
 
 #ifdef CONFIG_ARM64
 # define ZYNQ_GEM_DBUS_WIDTH	(1 << 21) /* 64 bit bus */