ARM: dts: msm: Add UICC mass storage luns for msm8974

USB UICC cards are supported on MSM8974. Add 1 lun to expose the user
partition in mass storage function.

Change-Id: Iebe50e6eb0d0f934e7e4e10b024ebe5c3cfb6721
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>