init: do not call pm_initialize() in os_start
init: do not call pm_initialize() in os_start

pm_initialize() should be called in MCU-specific routine not a general
init routine. So pm_initialize() in os_start() should be removed. In
case of arm/s5j, it is called twice, at first in up_pminitialize()
and then os_start(). This should be fixed.

Change-Id: I928b1d482fcf4efd75eb6b346724c595cdd8b0ae
Signed-off-by: EunBong Song <1a7e7e98e070490e67aa35ab67fbf9fdda8f48ac@samsung.com>

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