MIPS: u-boot.lds: introduce symbol __image_copy_end

This symbol is used in later patches as end address
for relocation of the U-Boot image into RAM.
Signed-off-by: NDaniel Schwierzeck <daniel.schwierzeck@gmail.com>

arch/mips/cpu/u-boot.lds

@@ -70,6 +70,8 @@ SECTIONS
 	uboot_end_data = .;
 
 	. = ALIGN(4);
+	__image_copy_end = .;
+
 	.bss : {
 		__bss_start = .;
 		*(.sbss.*)

arch/mips/include/asm/u-boot-mips.h

@@ -20,4 +20,10 @@ static inline unsigned long bss_end(void)
 	return (unsigned long) &__bss_end;
 }
 
+static inline unsigned long image_copy_end(void)
+{
+	extern ulong __image_copy_end;
+	return (unsigned long) &__image_copy_end;
+}
+
 extern int incaip_set_cpuclk(void);