ARM: legoev3: drop bi_arch_number

This drops assigning bi_arch_number on LEGO MINDSTORMS EV3. This board
never had its own unique number and since we are using device tree,
we no longer need to pass an arch number to Linux.

Signed-off-by: David Lechner <david@lechnology.com>

board/lego/ev3/legoev3.c

@@ -116,10 +116,6 @@ int board_init(void)
 {
 	irq_init();
 
-	/* arch number of the board */
-	/* LEGO didn't register for a unique number and uses da850evm */
-	gd->bd->bi_arch_number = MACH_TYPE_DAVINCI_DA850_EVM;
-
 	/* address of boot parameters */
 	gd->bd->bi_boot_params = LINUX_BOOT_PARAM_ADDR;