MIPS: Remove conflicting FPU check for code generation in soft-float mode.

TEST=

BUG=

Review URL: https://codereview.chromium.org/13724002
Patch from Dusan Milosavljevic <Dusan.Milosavljevic@rt-rk.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14158 ce2b1a6d-e550-0410-aec6-3dcde31c8c00