powerpc/64: Cleanup hard_irq_disable() macro

Minor cleanup to use helper function for manipulating
paca->soft_enabled variable.

Suggested-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>