Adjust the register layout to allow for 64bit registers in the
future for nf10bmac(4).  Also, add support for and enable RX interrupts.

MFC after:	2 weeks
Fix a bug on ip17x switch initialization which will fail as soon as you
disable the debug and diagnosis options from current.  We must wait 2ms
after the switch reset and not 2us.

Tested on RB433UAH.