phy: ti-pipe3: Update pcie phy settings

phy: ti-pipe3: Update pcie phy settings

Update the PCIe phy settings based on new settings available
in AM572x Technical Reference Manual[1] Revision I, revised
April 2017 in Table 26-62 "Preferred PCIe_PHY_RX SCP Register
Settings".

[1] http://www.ti.com/lit/ug/spruhz6i/spruhz6i.pdf

Cc: Vignesh R <vigneshr@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
[nsekhar@ti.com: commit message updates]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>