Fix verification of RX2 datarate
Fix verification of RX2 datarate

Datarate verification passed only if given datarate was a minimum
possible value. Instead datarate should be checked that it is less
than maximum value.

kjbracey-arm/mbed,c1728p9/mbed-os,c1728p9/mbed-os,andcor02/mbed-os,mbedmicro/mbed,betzw/mbed-os,kjbracey-arm/mbed,andcor02/mbed-os,c1728p9/mbed-os,betzw/mbed-os,andcor02/mbed-os,andcor02/mbed-os,betzw/mbed-os,betzw/mbed-os,kjbracey-arm/mbed,mbedmicro/mbed,c1728p9/mbed-os,c1728p9/mbed-os,betzw/mbed-os,betzw/mbed-os,andcor02/mbed-os,mbedmicro/mbed,mbedmicro/mbed,c1728p9/mbed-os,andcor02/mbed-os,mbedmicro/mbed,kjbracey-arm/mbed