spi: cadence: change sequence of calling runtime_enable

call pm_runtime_enable after set_active other wise it will
enable clock always.

Signed-off-by: Naga Sureshkumar Relli <nagasure@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Mark Brown <broonie@kernel.org>