[arm] Enable Crankshaft for all ARM targets.

Crankshaft doesn't actually require VFPv3, so there's no reason to
restrict it. V8 already requires at least VFPv2.

BUG=

Review-Url: https://codereview.chromium.org/2369913002
Cr-Commit-Position: refs/heads/master@{#39731}

src/arm/assembler-arm-inl.h

@@ -46,7 +46,7 @@
 namespace v8 {
 namespace internal {
 
-bool CpuFeatures::SupportsCrankshaft() { return IsSupported(VFPv3); }
+bool CpuFeatures::SupportsCrankshaft() { return true; }
 
 bool CpuFeatures::SupportsSimd128() { return false; }