[spi_device] Remove 2FF then pulse sync
[spi_device] Remove 2FF then pulse sync

payloadptr_clr is a pulse signal. Replacing Edge Detector to pulse
synchronizer.

Signed-off-by: Eunchan Kim <cb7bc7ceb22698f298c67faa994fd9ddf3cab298@opentitan.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan