Bluetooth: Controller: nRF53x: Fix missing sw_switch clear DPPI config

Fix missing sw_switch timer clear DPPI config when
re-enabling Tx or Rx after radio_disable() or
radio_switch_complete_and_disable() call in LLL state/role
contexts.

Relates to commit 1c365951 ("Bluetooth: controller:
nRF53x: Fix missing sw_switch clear DPPI config").

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>