drivers: serial: serial_omap: populate default clock frequency when not found in dt
In some platforms like am437x, serial node is not populated with clock-frequency node. So in that case have a default clock-clock frequency. Signed-off-by: NMugunthan V N <mugunthanvnm@ti.com> Reviewed-by: NLokesh Vutla <lokeshvutla@ti.com>
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