fix(st-uart): aarch64: wait for UART ISR register TC bit for console flush

Loop over the UART_ISR_TC bit to make sure the FIFO is emptied and all
the data is out of the shift register.
Fix the retur

fix(st-uart): aarch64: wait for UART ISR register TC bit for console flush

Loop over the UART_ISR_TC bit to make sure the FIFO is emptied and all
the data is out of the shift register.
Fix the return value that should be void in flush related functions
description.

Change-Id: Idbeecc3ca36b6ce506c9489b4f611bbe345121a3
Signed-off-by: Clément Le Goffic <legoffic.clement@gmail.com>

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fix(st-uart): aarch64: unwait for UART ISR register TC bit in putc function

The loop over the UART_ISR_TC flag was needed before the UART FIFO was
enabled. This allowed to make sure each character w

fix(st-uart): aarch64: unwait for UART ISR register TC bit in putc function

The loop over the UART_ISR_TC flag was needed before the UART FIFO was
enabled. This allowed to make sure each character written in TDR was
outputed.
This behavior is no more needed. Once a character is in the FIFO the
UART will empty it when it is clocked.

Change-Id: I914c7f75a451bedbcc9287d8ed9178db47b4eab4
Signed-off-by: Clément Le Goffic <legoffic.clement@gmail.com>

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feat(st-uart): add AARCH64 stm32_console driver

It is an adaptation for AARCH64 of the already existing AARCH32 driver.

Change-Id: Ifabf716a6bd188d2249650a34bbec1a602bcb017
Signed-off-by: Yann Gaut

feat(st-uart): add AARCH64 stm32_console driver

It is an adaptation for AARCH64 of the already existing AARCH32 driver.

Change-Id: Ifabf716a6bd188d2249650a34bbec1a602bcb017
Signed-off-by: Yann Gautier <yann.gautier@st.com>

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