powerpc/64s/exception: move head-64.h exception code to exception-64s.S

The head-64.h code should deal only with the head code sections
and offset calculations.

No generated code change except BUG line number constants.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190802105709.27696-19-npiggin@gmail.com