Removed need to supply the Symmetric flag to UpLo argument for Accelerate LLT and LDLT
This pull request removes the need to supply the Symmetric flag to the UpLo template argument for Accelerate's LLT and LDLT.
The Accelerate LLT and LDLT solvers require the supplied matrices to be symmetric. We therefore make it easier to utilize the support module by implicitly ORing the Symmetric flag with the supplied UpLo argument.
The UpLo argument to AccelerateQR and AccelerateCholeskyAtA has also been removed as it was unnecessary.