Use softpll_export.h instead of softpll_ng.h to handle stats exports from
the softpll.

For details, please check the following commit in the wrpc-sw repo
softpll: move stats defines to new file softpll_export.h

Additionally two new align state values:
ALIGN_STATE_WAIT_CLKIN
ALIGN_STATE_WAIT_PLOCK
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>