scsi: ufs-qcom: remove androidboot.bootdevice check

We were checking the "androidboot.bootdevice" kernel command line argument
to avoid probing the UFS during eMMC boot. This was good to have check but
not mandatory. Now that we may have 2 different instances of the UFS host
controller (one going to be attached with bootable embedded UFS device and
second one may be used to attach removable UFS device), having this hard
check would not allow the second host controller instance to be probed.
Hence this change removes androidboot.bootdevice check.

Change-Id: Ie0ad8df982eed39097618689f3f5a2099a2e83ca
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[cang@codeaurora.org: Resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>