[hdl] bump gn4124 core to bring in dma controller IRQ status fix and make SPEC testbench work with interrupts

[hdl] convert WRTD SVEC TDC-FD reference node to the Convention (synthesized, not tested, fails timing)

This driver will load the Mock Turtle device and
the FMC ADC 100M device
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>