fix(stm32mp13): correct USART addresses

On STM32MP13, USART1 and USART2 addresses are 0x4C000000 and 0x4C001000.
Whereas on STM32MP15, the addresses were 0x5C000000 and 0x4000E000.
Use dedicated flags to choose the correct address, that could be use
for early or crash console.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: I98bd97a0ac8b0408a50376801e2a1961b241a3d6
1 file changed