change mini_mips ARCH_VARIANT to mips32-fp instead of default mips32r2-fp

- As there is only one PDK release for mips, it should be the Least
  Common Denominator.

Bug: 7294949
Change-Id: I109ce7f91cfda504e6b9b4ee14761a8185b0095a
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 1d38da3..d20563d 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -7,6 +7,7 @@
 TARGET_NO_KERNEL := true
 
 TARGET_ARCH := mips
+TARGET_ARCH_VARIANT := mips32-fp
 TARGET_CPU_ABI := mips
 TARGET_CPU_SMP := true