mpc85xx/u-boot*.lds: remove _GLOBAL_OFFSET_TABLE_ definition

In binutils-2.25, the _GLOBAL_OFFSET_TABLE_ symbols defined by PROVIDE in
u-boot.lds overrides the linker built-in symbols
(https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff;
h=b893397a4b1316610f49819344817715e4305de9),
so the linker is treating _GLOBAL_OFFSET_TABLE_ as a definition into the
.reloc section.

To align with the change of binutils-2.25, the _GLOBAL_OFFSET_TABLE_ symbol
should not be defined in sections, and the symbols in linker generated .got
section should be used(https://sourceware.org/ml/binutils/2008-09/


msg00122.html)

Fixed the following build errors with binutils-2.25:
| powerpc-poky-linux-gnuspe-ld.bfd: _GLOBAL_OFFSET_TABLE_ not defined in
linker created .got

Signed-off-by: Zhenhua Luo <zhenhua.luo@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>

arch/powerpc/cpu/mpc85xx/u-boot-nand.lds

@@ -44,7 +44,6 @@ SECTIONS
     _GOT2_TABLE_ = .;
     KEEP(*(.got2))
     KEEP(*(.got))
-    PROVIDE(_GLOBAL_OFFSET_TABLE_ = . + 4);
     _FIXUP_TABLE_ = .;
     KEEP(*(.fixup))
   }

arch/powerpc/cpu/mpc85xx/u-boot-nand_spl.lds

@@ -22,7 +22,6 @@ SECTIONS
 		_GOT2_TABLE_ = .;
 		KEEP(*(.got2))
 		KEEP(*(.got))
-		PROVIDE(_GLOBAL_OFFSET_TABLE_ = . + 4);
 		_FIXUP_TABLE_ = .;
 		KEEP(*(.fixup))
 	}

arch/powerpc/cpu/mpc85xx/u-boot-spl.lds

@@ -29,7 +29,6 @@ SECTIONS
 		_GOT2_TABLE_ = .;
 		KEEP(*(.got2))
 		KEEP(*(.got))
-		PROVIDE(_GLOBAL_OFFSET_TABLE_ = . + 4);
 		_FIXUP_TABLE_ = .;
 		KEEP(*(.fixup))
 	}

arch/powerpc/cpu/mpc85xx/u-boot.lds

@@ -50,7 +50,6 @@ SECTIONS
     _GOT2_TABLE_ = .;
     KEEP(*(.got2))
     KEEP(*(.got))
-    PROVIDE(_GLOBAL_OFFSET_TABLE_ = . + 4);
     _FIXUP_TABLE_ = .;
     KEEP(*(.fixup))
   }