msm: emac: Correct phy programming sequence on mdm9607

correct sgmii phy sequence as per recommendation from hw
team.

CRs-fixed: 965249

Change-Id: I7bb21b484f7597c462b7076344b0fd960b0dc6e3
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>
Signed-off-by: Sridhar Ancha <sancha@codeaurora.org>