[OpenCL] Uses Eigen implementation of asinh, acosh and atanh (#12010)

* [hotfix] Re-enable once available in Eigen

	- acosh
	- asinh
	- atanh

* [OpenCL] hyperbolic function registration

 Registers:
  - acosh
  - asinh
  - atanh

* Fixes typo: SYC->SYCL

* [Eigen] Bumps to the version that supports asinh, acosh and atanh

* [Eigen] Version Bump that covers: https://github.com/tensorflow/tensorflow/pull/12010#issuecomment-327412653

* Avoid numext implementation for Android (asinh, acosh, atanh)

* As requested in https://github.com/tensorflow/tensorflow/pull/12010#issuecomment-331531894

* #if instead of #ifdef EIGEN_HAS_CXX11_MATH