phy: cadence-torrent: Add multi link PCIe configuration for 100MHz refclk

From: Swapnil Jakhade <sjakhade@cadence.com>

Add register sequences to support multi link PCIe configuration for
100MHz refclk. Maximum two PCIe links are supported.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Signed-off-by: Dasnavis Sabiya <sabiya.d@ti.com>
Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>