phy: qcom-ufs: separate out 2 lanes configuration

Some platforms have 2 UFS PHY instances, one instance supports 2-lane while
other instance supports only 1-lane. This change separates out the 2nd lane
configuration from 1-lane configuration so that we can apply the 2nd lane
configuration only if needed.

Change-Id: Idcf8aaa8ed7a9662c0f4186e5a28d2405f8fd5fc
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[cang@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>