serial: stm32: Fix bits defines name
Rename USART_ISR_FLAG_xxx bits to USART_ISR_xxx bits and USART_ICR_OREF to USART_ICR_ORECF in order to match datasheets. Sort defines by descendant order. Signed-off-by: NPatrice Chotard <patrice.chotard@st.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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