arm: Note vendor-required status of certain MACH_TYPE values

In the cases of some boards, a MACH_TYPE number is used which is either
not registered upstream or worse (for functionality) is re-using the
number of a different (or reference) platform instead.  Make sure we
have a comment in these cases.

Cc: Albert ARIBAUD <albert.aribaud@3adev.fr>
Cc: Walter Schweizer <swwa@users.sourceforge.net>
Cc: Stefan Roese <sr@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/omap3_cairo.h b/include/configs/omap3_cairo.h
index 09f4ec0..b5d2b00 100644
--- a/include/configs/omap3_cairo.h
+++ b/include/configs/omap3_cairo.h
@@ -228,9 +228,8 @@
 #define CONFIG_SERIAL2
 #endif
 
-/* Provide MACH_TYPE for compatibility with non-DT kernels */
-#define MACH_TYPE_OMAP3_CAIRO	3063
-#define CONFIG_MACH_TYPE	MACH_TYPE_OMAP3_CAIRO
+/* Provide the MACH_TYPE value the vendor kernel requires */
+#define CONFIG_MACH_TYPE	3063
 
 /*-----------------------------------------------------------------------
  * FLASH and environment organization