ARM: 7022/1: allow to detect conflicting zreladdrs

Boards used to specify zreladdr in their Makefile.boot with
zreladdr-y := x, so conflicting zreladdrs were silently overwritten.
This patch changes this to zreladdr-y += x, so that we end
up with multiple words in zreladdr in such a case. We can
detect this later and complain if necessary.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-lpc32xx/Makefile.boot b/arch/arm/mach-lpc32xx/Makefile.boot
index b796b41..2cfe0ee 100644
--- a/arch/arm/mach-lpc32xx/Makefile.boot
+++ b/arch/arm/mach-lpc32xx/Makefile.boot
@@ -1,4 +1,4 @@
-   zreladdr-y	:= 0x80008000
+   zreladdr-y	+= 0x80008000
 params_phys-y	:= 0x80000100
 initrd_phys-y	:= 0x82000000