ppc: Enable full relocation to RAM

The following changes allow U-Boot to fully relocate from flash to
RAM:
 - Remove linker scripts' .fixup sections from the .text section
 - Add -mrelocatable to PLATFORM_RELFLAGS for all boards
 - Define CONFIG_RELOC_FIXUP_WORKS for all boards

Previously, U-Boot would partially relocate, but statically initialized
pointers needed to be manually relocated.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/include/asm-ppc/config.h b/include/asm-ppc/config.h
index e35b0b7..eba7901 100644
--- a/include/asm-ppc/config.h
+++ b/include/asm-ppc/config.h
@@ -47,4 +47,7 @@
 #define CONFIG_MAX_CPUS		1
 #endif
 
+/* Relocation to SDRAM works on all PPC boards */
+#define CONFIG_RELOC_FIXUP_WORKS
+
 #endif /* _ASM_CONFIG_H_ */