imx8mp_evk: Delete noncached memory config

DWC EQOS driver has removed to use noncached memory, so delete
the configuration from iMX8MP EVK head file.
Signed-off-by: NYe Li <ye.li@nxp.com>

include/configs/imx8mp_evk.h

@@ -43,9 +43,6 @@
 #define FEC_QUIRK_ENET_MAC
 
 #define DWC_NET_PHYADDR			1
-#ifdef CONFIG_DWC_ETH_QOS
-#define CONFIG_SYS_NONCACHED_MEMORY     (1 * SZ_1M)     /* 1M */
-#endif
 
 #define PHY_ANEG_TIMEOUT 20000