Merge changes from topic 'rm-loopfilter-count-param'

* changes:
  lpf_8_test: remove unneeded function wrapper
  remove loopfilter 'count' param TODOs
  split vpx_highbd_lpf_horizontal_16 in two
  split vpx_lpf_horizontal_16 in two
  vpx_highbd_lpf_horizontal_4: remove unused count param
  vpx_highbd_lpf_horizontal_8: remove unused count param
  vpx_highbd_lpf_vertical_4: remove unused count param
  vpx_highbd_lpf_vertical_8: remove unused count param
  vpx_lpf_horizontal_4: remove unused count param
  vpx_lpf_horizontal_8: remove unused count param
  vpx_lpf_vertical_4: remove unused count param
  vpx_lpf_vertical_8: remove unused count param
  lpf_8_test: add missing dspr2 tests
  lpf_8_test: add missing vpx_lpf_horizontal_4 tests
  lpf_8_test: add missing vpx_lpf_vertical_4 tests
  lpf_8_test: simplify function wrapper generation