drivers: mcr20a: small improvements
drivers: mcr20a: small improvements

Issue a error message, if the _mcr20a_read_reg fails.

Do not execute SPI burst read/write if the buffer is too small.

Unlock mutex if set_pan_id, set_short_addr or set_ieee_addr
fail.

Force abort of the sequence when the higher level changes the channel
even though a T or TR sequence is in progress.

Signed-off-by: Johann Fischer <b39b26e1812eb092eb217277792f3735321fa456@phytec.de>

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