[hermon] Fix incorrectly-padded sense_port structure

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/infiniband/hermon.h

 	pseudo_bit_t reserved0[0x00020];
 /* -------------- */
 	pseudo_bit_t port_type[0x00002];
-	pseudo_bit_t reserved1[0x00018];
+	pseudo_bit_t reserved1[0x0001e];
 } __attribute__ (( packed ));
 
 struct hermonprm_set_port_ib_st {