MIPS32: Mark kQuickPow as direct entrypoint

This fixes mips32 build.
This is a follow-up to Iaa31f70acabbd57c163cfeafe02eed67c1348861.

Test: successful mips32 build
Change-Id: I959304745e7f93a64fdee792c0f3199cee2eefff
diff --git a/runtime/arch/mips/entrypoints_direct_mips.h b/runtime/arch/mips/entrypoints_direct_mips.h
index 1020781..3a6625f 100644
--- a/runtime/arch/mips/entrypoints_direct_mips.h
+++ b/runtime/arch/mips/entrypoints_direct_mips.h
@@ -54,6 +54,7 @@
       entrypoint == kQuickAsin ||
       entrypoint == kQuickAtan ||
       entrypoint == kQuickAtan2 ||
+      entrypoint == kQuickPow ||
       entrypoint == kQuickCbrt ||
       entrypoint == kQuickCosh ||
       entrypoint == kQuickExp ||