MPC8572DS: Fix compile warnings

Commit 445a7b38 introduced the following
compile warnings:

cmd_i2c.c:112: warning: missing braces around initializer
cmd_i2c.c:112: warning: (near initialization for 'i2c_no_probes[0]')

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

include/configs/MPC8572DS.h

@@ -299,7 +299,7 @@ extern unsigned long get_board_ddr_clk(unsigned long dummy);
 #define CFG_I2C_SPEED		400000	/* I2C speed and slave address */
 #define CFG_I2C_EEPROM_ADDR	0x57
 #define CFG_I2C_SLAVE		0x7F
-#define CFG_I2C_NOPROBES	{0,0x29} /* Don't probe these addrs */
+#define CFG_I2C_NOPROBES	{{0,0x29}}/* Don't probe these addrs */
 #define CFG_I2C_OFFSET		0x3000
 #define CFG_I2C2_OFFSET		0x3100