RoCE is only supported on Thor and onwards chips.
bnxt_init_sctx_variants() unconditionally set isc_admin_intrcnt to
BNXT_ROCE_IRQ_COUNT for every PF device, stealing 9 MSI-x vectors from
older, non-RoCE-capable chips that will never use them.

Gate the reservation on the device ID: RoCE-capable chips keep
BNXT_ROCE_IRQ_COUNT, other chips fall back to 1, the baseline
isc_admin_intrcnt value used before RoCE support (commit 050d28e13cde).