Bluetooth: controller: Fix redundant length update event
Bluetooth: controller: Fix redundant length update event

Fix generation of redundant length update event when no
change in effective octets or time.

Fixes LL.TS.5.0.2 conformance tests:
LL/CON/MAS/BV-73-C [Master Data Length Update - Responding
	to Data Length Update Procedure; LE 1M PHY]
LL/CON/MAS/BV-74-C [Master Data Length Update - Initiating
	Data Length Update Procedure; LE 1M PHY]
LL/CON/MAS/BV-76-C [Master Data Length Update - Responding
	to Data Length Update Procedure; LE 2M PHY]
LL/CON/MAS/BV-77-C [Master Data Length Update - Initiating
	Data Length Update Procedure; LE 2M PHY]
LL/CON/SLA/BV-77-C [Slave Data Length Update - Responding
	to Data Length Update Procedure; LE 1M PHY]
LL/CON/SLA/BV-78-C [Slave Data Length Update - Initiating
	Data Length Update Procedure; LE 1M PHY]
LL/CON/SLA/BV-80-C [Slave Data Length Update - Responding
	to Data Length Update Procedure; LE 2M PHY]
LL/CON/SLA/BV-81-C [Slave Data Length Update - Initiating
	Data Length Update Procedure; LE 2M PHY]

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

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