wifinative jni: Fix build by changing constexpr to const

constexpr is only available from c++11, but old android makefiles
do not specify c++11 options.
In order to fix that, this changes constexpr to const.

Bug: 37207928
Test: compile
Change-Id: I75257f19177907ded64f563e1bf8be3a748bf741
1 file changed
tree: 5aca27b7dc62526bdfa07a1ad38f094ee483633c
  1. service/