Bluetooth: Controller: Revert EVENT_OVERHEAD_START_US for Coded PHY

Revert EVENT_OVERHEAD_START_US value for Coded PHY support,
needed to pass LL/DDI/SCN/BV-21-C and LL/DDI/SCN/BV-25-C.

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