powerpc: t1040qds: Use generic ethsw commands

The commands for the VSC9953 l2 switch from T1040 became generic in
patch https://patchwork.ozlabs.org/patch/499748/ and the define
was renamed.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@nxp.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <york.sun@nxp.com>

include/configs/T1040QDS.h

@@ -677,7 +677,7 @@ unsigned long get_board_ddr_clk(void);
 
 /* Enable VSC9953 L2 Switch driver */
 #define CONFIG_VSC9953
-#define CONFIG_VSC9953_CMD
+#define CONFIG_CMD_ETHSW
 #define CONFIG_SYS_FM1_QSGMII11_PHY_ADDR	0x14
 #define CONFIG_SYS_FM1_QSGMII21_PHY_ADDR	0x18