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The base address of UART peripheral should be given in R0, not in R1.
Otherwise the console_stm32_core_flush issues an assert message.
This issue was highlighted with recent changes in console flush functions.

Change-Id: Iead01986fdbbf30ad2fd9fa515a1d2b611b4e591
Signed-off-by: Yann Gautier <yann.gautier@st.com>