src: Fix trigger shifting. Block original trigger.

This guarantees proper sending of next bit upon resynchronisation where
PH2 is shortened to 0!
6 jobs for 360-fix-tx-rx-simultaneous-trigger in 17 minutes and 32 seconds
Status Job ID Name Coverage
  Precheck
passed #66167
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check_component

00:00:09

 
  Build
passed #66170
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build_doc

00:00:30

passed #66169
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build_driver

00:01:21

passed #66168
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build_ip_and_tests

00:02:11

passed #66171
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build_linux_driver

00:00:17

 
  Test
passed #66172
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test_ip_fast

00:14:23