ppp: replace PPP_MTU with PPP_MRU

This replaces the uses of PPP_MTU with PPP_MRU
since both are identical.

Change-Id: Id5c1c590f4c04ab5d6b79da520b5c8eae01881e6
Signed-off-by: tirupathireddy <tirupath@codeaurora.org>
4 files changed