soc/intel/*: drop UART pad configuration from common code

UART pad configuration should not be done in common code, because that
may cause short circuits, when the user sets a wrong UART index.

Since all boards do pad setup on their own now, finally drop the pad
configuration from SoC common code.

Change-Id: Id03719eb8bd0414083148471ed05dea62a895126
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
---
M src/soc/intel/alderlake/uart.c
M src/soc/intel/apollolake/uart.c
M src/soc/intel/cannonlake/bootblock/bootblock.c
M src/soc/intel/cannonlake/uart.c
M src/soc/intel/common/block/include/intelblocks/uart.h
M src/soc/intel/common/block/uart/Kconfig
M src/soc/intel/common/block/uart/uart.c
M src/soc/intel/elkhartlake/uart.c
M src/soc/intel/icelake/uart.c
M src/soc/intel/jasperlake/uart.c
M src/soc/intel/skylake/uart.c
M src/soc/intel/tigerlake/uart.c
12 files changed, 46 insertions(+), 334 deletions(-)