phy: Add support for NS2 SATA3 PHY in Broadcom SATA3 PHY driver

This patch adds support for Broadcom NS2 SATA3 PHY in existing
Broadcom SATA3 PHY driver.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>