diag: Add support for MSMFERRUM QPST string

MSMFERRUM is a new device. Add diag support for sending
appropriate model number for MSMFERRUM so that QPST
can display the appropriate string.

Change-Id: I1a75b705e606d6e4ef7480760a47871a1a9f2bce
Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>