Bluetooth: controller: Fix handling of invalid Ctrl PDU lengths
Bluetooth: controller: Fix handling of invalid Ctrl PDU lengths

Fix the controller implementation to handle Control PDUs
with invalid lengths by responding with Unknown Response
PDU.

Fixes LL.TS.5.0.2 conformance tests:
LL/PAC/SLA/BI-01-C [Control PDUs with Invalid Length from
	Master]
LL/PAC/MAS/BI-01-C [Control PDUs with Invalid Length from
	Slave]

Signed-off-by: Vinayak Kariappa Chettimada <e780c9f87dc729ad454f47292ad82c8652353064@nordicsemi.no>

zephyriot/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,explora26/zephyr,kraj/zephyr,galak/zephyr,Vudentz/zephyr,zephyriot/zephyr,finikorg/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,nashif/zephyr,finikorg/zephyr,explora26/zephyr,finikorg/zephyr,Vudentz/zephyr,ldts/zephyr,punitvara/zephyr,ldts/zephyr,kraj/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,explora26/zephyr,Vudentz/zephyr,mbolivar/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,zephyriot/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,explora26/zephyr,galak/zephyr,zephyriot/zephyr,punitvara/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,explora26/zephyr,Vudentz/zephyr,mbolivar/zephyr,mbolivar/zephyr,mbolivar/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,ldts/zephyr,nashif/zephyr,zephyriot/zephyr