stm32: Use generic console_t data structure

Since now the generic console_t structure holds the UART base address as
well, let's use that generic location and drop the UART driver specific
data structure at all.

Change-Id: Iea6ca26ff4903c33f0fad27fec96fdbabd4e0a91
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
4 files changed