GigaMAC registers have been reported left unitialized in several
situations:
- after cold boot from power-off state
- after S3 resume

Tweaking rtl_hw_phy_config takes care of both.

This patch removes an excess entry (",") at the end of the exgmac_reg
array as well.
Signed-off-by: NFrancois Romieu <romieu@fr.zoreil.com>
Signed-off-by: NWang YanQing <udknight@gmail.com>
Cc: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>