clCreateBuffer(): Ensure allocation meets minimum alignment for double16 type

Previously, clCreateBuffer() was using malloc to allocate buffers, which
caused havoc with NEON instructions expecting 128 bit alignment for float4
vectors.

Now, use posix_memallign() to ensure alignment meets requirements of largest
OpenCL data type (double16).

Also, update clGetDeviceInfo()'s CL_DEVICE_MEM_BASE_ADDR_ALIGN and
CL_DEVICE_MIN_DATA_TYPE_ALIGN_SIZE accordingly.

Signed-off-by: Gil Pitney <gil.pitney@linaro.org>

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