Fix detecting R4T1 Rhino card with dahdi_genconf

/proc/dahdi/* With "rhino-linux-0.99.6b4" rxt1 drivers shows: 
Span 1: R4T1/0/* "R4T1 Card 0 Span *" ESFB8ZS/ ClockSource
so dahdi_tool gets that in its $head and can't configue the card.
Looks like the old drivers had the PCI.

For reference: rhino's 0.99.6b4 rxt1_base.c line 1542:"sprintf(rxt1_span->span.desc, "R%dT1 Card %d Span %d", rxt1_card->numspans"
(NO PCI present)