USB: android: Add support for USB UICC mass storage

USB UICC cards can support multiple partitions which can be
exposed to the host via USB mass storage function. The number
of partitions of UICC card may vary for each target. Hence
create a device tree property to accept the required luns.

CRs-Fixed: 639635
Change-Id: I5bf5e9acd9fed72adffe469b602ab2d431ccfa3e
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>