driver: uart: clock control code refactoring
Small code refactorisation in order to ease up coming
support of stm32f1 series by stm32 commom clock control
driver
Change-Id: I486cfba137cd048d65f0732e10aa29d877bb03e5
Signed-off-by:
Erwan Gouriou <erwan.gouriou@linaro.org>
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