nommu: Add ATAG_CORE* definitions to head-nommu.S

These definitions are now required by head-common.S in arch/arm/kernel.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm/kernel/head-nommu.S

@@ -21,6 +21,9 @@
 #include <asm/thread_info.h>
 #include <asm/system.h>
 
+#define ATAG_CORE	0x54410001
+#define ATAG_CORE_SIZE	((2*4 + 3*4) >> 2)
+
 /*
  * Kernel startup entry point.
  * ---------------------------