msm: smd_tty: Add locking hierarchy
SMD TTY has several locks and it isn't clear what each lock manages.
Add a locking hierarchy and clarify locking scope.
Change-Id: I0026925a80548ef0025666d028b35e70d752a317
Signed-off-by:
Eric Holmberg <eholmber@codeaurora.org>
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