Convert SAM SoC SERIAL drivers to DT macros

[nandojve]

This convert Atmel SAM/SAM0 SERIAL drivers to use DT macros.

see #23107

[zephyrbot]

All checks passed.

checkpatch (informational only, not a failure)

-:187: WARNING:TRAILING_SEMICOLON: macros should not use a trailing semicolon
#187: FILE: drivers/serial/uart_sam.c:340:
+#define UART_SAM_IRQ_HANDLER_DECL(n)					\
+static void uart##n##_sam_irq_config_func(struct device *port);

-:391: WARNING:SUSPECT_CODE_INDENT: suspect code indent for conditional statements (8, 8)
#391: FILE: drivers/serial/uart_sam0.c:933:
 	do {								\
+	IRQ_CONNECT(DT_IRQ_BY_IDX(UART(n), m, irq),			\

-:487: WARNING:COMPLEX_MACRO: Macros with complex values should be enclosed in parentheses
#487: FILE: drivers/serial/uart_sam0.c:987:
+#define UART_SAM0_SERCOM_PADS(n)					\
+	(DT_PROP(UART(n), rxpo) << SERCOM_USART_CTRLA_RXPO_Pos) |	\
+	(DT_PROP(UART(n), txpo) << SERCOM_USART_CTRLA_TXPO_Pos)

-:699: WARNING:TRAILING_SEMICOLON: macros should not use a trailing semicolon
#699: FILE: drivers/serial/usart_sam.c:341:
+#define USART_SAM_IRQ_HANDLER_DECL(n)					\
+static void usart##n##_sam_irq_config_func(struct device *port);

- total: 0 errors, 4 warnings, 986 lines checked

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[stephanosio]

I can see that we cannot use DT_INST_n here because the SAM/SAM0 device tree does not fully incorporate device clock and I/O mappings, and DT_INST_n does not necessarily match the UART_n or SERCOM_n definitions used to infer device clock and I/Os.

This should eventually be fixed, but I guess that is out of scope for this PR.

[nandojve]

rebase and add d5d1639 to fix sam3x. Now we need all nodes with index.

[galak]

The SAM (not SAM0) part of this should now be handled by #24319

[nandojve]

Close in favor of #24319, #24572.