Revert "arm: Remove unregister MACH_TYPE_xxx uses"

This reverts commit 70b26cd057f42c7126088b49d4285955c8a00eae.

This is not a strict revert as it is easier to fix
board/atmark-techno/armadillo-800eva/armadillo-800eva.c to now the
correct name (same value) than to revert that change too.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/davinci/ea20/ea20.c b/board/davinci/ea20/ea20.c
index 30e4c7d..66804d7 100644
--- a/board/davinci/ea20/ea20.c
+++ b/board/davinci/ea20/ea20.c
@@ -277,6 +277,9 @@
 
 int board_init(void)
 {
+	/* arch number of the board */
+	gd->bd->bi_arch_number = MACH_TYPE_EA20;
+
 	/* address of boot parameters */
 	gd->bd->bi_boot_params = LINUX_BOOT_PARAM_ADDR;