scsi: ufs-qcom: increase max UFS host count to 2

Newer chipsets may have 2 instances of UFS host controllers, one for
embedded UFS device and another for removable UFS card. This change
increases the MAX_UFS_QCOM_HOSTS to 2 so it can hold the pointers
to data structures of both the UFS host controllers. To save the
pointers at relevant index, we will get alias id for the given
device_node using the "ufshcX" alias ids (where X is either 1 or 2).

Change-Id: I1bf47a499a64407b2d10fb36c5cd3e77c90b0bb8
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[cang@codeaurora.org: Resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>