RDMA/core: Add new IB rate for XDR (8x) support

Add the new rates as defined in the Infiniband spec for XDR and 8x
link width support.

Furthermore, modify the utility conversion methods accordingly.

Reference: IB Spec Release 1.8

Reviewed-by: Michael Guralnik <[e-mail]>
Signed-off-by: Maher Sanalla <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Reviewed-by: Kalesh AP <[e-mail]>
Signed-off-by: Leon Romanovsky <[e-mail]>

drivers/infiniband/core/verbs.c

···
 	case IB_RATE_400_GBPS: return 160;
 	case IB_RATE_600_GBPS: return 240;
 	case IB_RATE_800_GBPS: return 320;
+	case IB_RATE_1600_GBPS: return 640;
 	default:	       return  -1;
 	}
 }
···
 	case 160: return IB_RATE_400_GBPS;
 	case 240: return IB_RATE_600_GBPS;
 	case 320: return IB_RATE_800_GBPS;
+	case 640: return IB_RATE_1600_GBPS;
 	default:  return IB_RATE_PORT_CURRENT;
 	}
 }
···
 	case IB_RATE_400_GBPS: return 425000;
 	case IB_RATE_600_GBPS: return 637500;
 	case IB_RATE_800_GBPS: return 850000;
+	case IB_RATE_1600_GBPS: return 1700000;
 	default:	       return -1;
 	}
 }

include/rdma/ib_verbs.h

···
 	IB_RATE_400_GBPS = 21,
 	IB_RATE_600_GBPS = 22,
 	IB_RATE_800_GBPS = 23,
+	IB_RATE_1600_GBPS = 25,
 };
 
 /**