Fix mips relocation to use load_bias as intended

Bug: http://b/20658994
Change-Id: I5a15605fe34db359e26d563e13841ae993083c4a
(cherry picked from commit 0373d4f47342e0a6f146af9023a146b0b707442b)
diff --git a/linker/linker_mips.cpp b/linker/linker_mips.cpp
index 0769f82..87b811f 100644
--- a/linker/linker_mips.cpp
+++ b/linker/linker_mips.cpp
@@ -128,7 +128,7 @@
         if (s != nullptr) {
           *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr;
         } else {
-          *reinterpret_cast<ElfW(Addr)*>(reloc) += base;
+          *reinterpret_cast<ElfW(Addr)*>(reloc) += load_bias;
         }
         break;
       default: