a72c060fb0
doesn't support NWAY, the RealTek PHY (both the integrated ones on 8139 chips and the RTL8201L 10/100 PHY) will not report the link speed via the ANLPAR or BMSR registers. For the 8201L, we need to look in magic vendor-specific PHY register 0x19. For the 8139 MAC+PHY combo, we have to be able to test the RL_MEDIASTAT register. The changes to rlphy.c are based largely on the patch from PR 30836, however I tried to eliminate some magic numbers by creating an entry for the 8201 PHY in miidevs. Also updated if_rl.c to allow the rlphy driver to read the RL_MEDIASTAT register via the rl_miibus_readreg() routine.