net: lwm2m: use BIT macro instead of LWM2M_OP_BIT
net: lwm2m: use BIT macro instead of LWM2M_OP_BIT

Now that the LWM2M_OP_* bits have been renumbered, we no longer need
a custom BIT() macro for the LwM2M code.  Let's remove it and use
BIT() instead.

Signed-off-by: Michael Scott <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@opensourcefoundries.com>

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