msm: uim: Add UIM driver support

Add driver support for UIM (User Identification Module) in BLSP of MSM
architectures. This registers a character device driver with the name
"qcom,uim", and allows user mode applications to interact with UIM
via /dev/uim[N] device files.

Change-Id: I95f42632147c7366a7f1316f4a67b3f902779f3c
Acked-by: Ho Lee <holee@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>