kernel: [fix] [backport] update submodules to allow the FMC-ADC v4.1 software to work with newer kernels.

Tested with kernels 4.15, 4.19, 5.0 and 5.2.

NOTE: the WR NIC from the spec-sw is still not up-to-date. It is important to compile
the FMC-ADC software with 'CONFIG_WR_NIC=n make' to prevent the NIC from being compiled.