drivers: ieee802154: kw41z: fix issue in RX sequence
drivers: ieee802154: kw41z: fix issue in RX sequence

The chip seems to require a wait time before reading packet
data after the RX sequence done interrupt, as imidiate reading
of it will indicate a packet size of zero and cause the RX
sequence done to be continually retriggered.

In addition, the extra clearing of the interrupt flags can be
removed, as this is already done at the beginning of the isr.

Jira: ZEP-2278
Signed-off-by: Bogdan Davidoaia <608e12617a4d171cadd3703dd4e053258305481d@linaro.org>

galak/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,fbsder/zephyr,mbolivar/zephyr,ldts/zephyr,mbolivar/zephyr,fbsder/zephyr,Vudentz/zephyr,kraj/zephyr,explora26/zephyr,runchip/zephyr-cc3220,explora26/zephyr,explora26/zephyr,rsalveti/zephyr,holtmann/zephyr,runchip/zephyr-cc3220,fbsder/zephyr,Vudentz/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,rsalveti/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,rsalveti/zephyr,runchip/zephyr-cc3220,punitvara/zephyr,finikorg/zephyr,ldts/zephyr,aceofall/zephyr-iotos,nashif/zephyr,zephyriot/zephyr,explora26/zephyr,rsalveti/zephyr,mbolivar/zephyr,galak/zephyr,galak/zephyr,aceofall/zephyr-iotos,holtmann/zephyr,finikorg/zephyr,aceofall/zephyr-iotos,Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,holtmann/zephyr,zephyriot/zephyr,finikorg/zephyr,fbsder/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,punitvara/zephyr,zephyriot/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,holtmann/zephyr,holtmann/zephyr,rsalveti/zephyr,punitvara/zephyr,nashif/zephyr,nashif/zephyr,runchip/zephyr-cc3220,Vudentz/zephyr,kraj/zephyr,aceofall/zephyr-iotos,galak/zephyr,kraj/zephyr,zephyriot/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,kraj/zephyr,runchip/zephyr-cc3220,Vudentz/zephyr,ldts/zephyr,galak/zephyr,Vudentz/zephyr,kraj/zephyr,fbsder/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,punitvara/zephyr,mbolivar/zephyr