msm: rmnet: Add platform device validation

If a platform device probe is done and the matching device is not found,
then the existing code may still return success (0) even though it
should return ENODEV.

Return ENODEV if no match for the platform device is found.

Change-Id: I1a55c29600dbbfed3fe8f0302c810e22a9eba29c
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>