s5j/serial: refactor up_setup()
s5j/serial: refactor up_setup()

This patch separates up_configure() function, which configures baud
rate, bits and parity, from up_setup(). The up_configure() function
can be called when baud, bits or parity is initialized or changed.

Change-Id: I6f12d57f969fe0fbbde0e13583bde4f0032bccd6
Signed-off-by: Wonsang Ryou <bc48fb2bc21aa3a9d3ccd13729d9fc0f5ca913dd@samsung.com>

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