soc/amd/picasso/uart: introduce and use soc_get_uart_ctrlr_info

Introduce and use soc_get_uart_ctrlr_info to access the uart_info array
to further decouple uart_info from the code as preparation to factor out
most of the code to a common implementation. In order to slightly reduce
the number of function calls, pass the size of and pointer to uart_info
to get_uart_idx as a parameter instead of calling again
soc_get_uart_ctrlr_info in get_uart_idx despite all callers already
having the information form the soc_get_uart_ctrlr_info call.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I474e47059eaebcf0b9b77f66ee993f1963ebee77
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68534
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>

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