uart: qmsi: Add driver API reentrancy support to UART shim driver
Global data and device setting can be messed up by concurrent
API calls. This change is to serialize the access.
Jira: ZEP-454
Change-Id: I520722aecab7db443d053fd45498a22e165889de
Signed-off-by:
Baohong Liu <baohong.liu@intel.com>
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