Force the literal pool dump before reloc_end

In the arch/arm/boot/compressed/head.S file, the contents of the
literal pool accumulated during the relocatable code must be dumped
before reloc_end.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm/boot/compressed/head.S

@@ -833,6 +833,7 @@ memdump:	mov	r12, r0
 		mov	pc, r10
 #endif
 
+		.ltorg
 reloc_end:
 
 		.align