USB shared memory DUN(dial up networking) driver re-tries multiple times
to open smd channel, due to delay in smd driver initialization and modem
load during boot up. Instead, register a platform driver with smd channel
name. Whenever specific SMD channel is opened by modem, a corresponding
platform device would be added resulting in probe of platform driver being
called. In the probe function, DUN driver opens up SMD channel
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
d3fb9bb50c