drivers/serial: simplify signaling method
drivers/serial: simplify signaling method

Commit ca9015e7 set xmitsem as a signaling semaphore. So we do not need
to use sem_wait_for_isr and sem_post_from_isr for xmitsem.

Change-Id: I4d895429f5f55014be463721bf642d513593d3ae
Signed-off-by: EunBong Song <1a7e7e98e070490e67aa35ab67fbf9fdda8f48ac@samsung.com>

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