soc: atmel_sam0: Add SAMD5x/SAME5x family

[benpicco]

The SAME5x/SAMD5x is a line of Cortex-M4F MCUs that share peripherals with the sam0 Cortex-M0+ and saml1x Cortex-M23 parts.

split off from #14685

[zephyrbot]

All checks passed.

checkpatch (informational only, not a failure)

-:260: WARNING:UNDOCUMENTED_DT_STRING: DT compatible string "atmel,sam0-trng" appears un-documented -- check ./dts/bindings/
#260: FILE: dts/arm/atmel/samd5x.dtsi:242:
+			compatible = "atmel,sam0-trng";

-:692: WARNING:LONG_LINE: line over 80 characters
#692: FILE: soc/arm/atmel_sam0/common/soc_samd5x.c:26:
+	OSC32KCTRL->XOSC32K.reg = OSC32KCTRL_XOSC32K_ENABLE | OSC32KCTRL_XOSC32K_XTALEN

-:693: WARNING:LONG_LINE: line over 80 characters
#693: FILE: soc/arm/atmel_sam0/common/soc_samd5x.c:27:
+				| OSC32KCTRL_XOSC32K_EN32K | OSC32KCTRL_XOSC32K_RUNSTDBY

-:724: WARNING:LONG_LINE: line over 80 characters
#724: FILE: soc/arm/atmel_sam0/common/soc_samd5x.c:58:
+	GCLK->PCHCTRL[OSCCTRL_GCLK_ID_FDPLL0 + n].reg = GCLK_PCHCTRL_GEN(1) | GCLK_PCHCTRL_CHEN;

-:725: WARNING:LONG_LINE: line over 80 characters
#725: FILE: soc/arm/atmel_sam0/common/soc_samd5x.c:59:
+	while (!(GCLK->PCHCTRL[OSCCTRL_GCLK_ID_FDPLL0 + n].reg & GCLK_PCHCTRL_CHEN)) {

-:928: WARNING:LONG_LINE: line over 80 characters
#928: FILE: soc/arm/atmel_sam0/samd51/dts_fixup.h:13:
+#define DT_NUM_IRQ_PRIO_BITS	DT_ARM_V7M_NVIC_E000E100_ARM_NUM_IRQ_PRIORITY_BITS

-:1106: WARNING:LONG_LINE: line over 80 characters
#1106: FILE: soc/arm/atmel_sam0/same51/dts_fixup.h:13:
+#define DT_NUM_IRQ_PRIO_BITS	DT_ARM_V7M_NVIC_E000E100_ARM_NUM_IRQ_PRIORITY_BITS

-:1276: WARNING:LONG_LINE: line over 80 characters
#1276: FILE: soc/arm/atmel_sam0/same53/dts_fixup.h:13:
+#define DT_NUM_IRQ_PRIO_BITS	DT_ARM_V7M_NVIC_E000E100_ARM_NUM_IRQ_PRIORITY_BITS

-:1442: WARNING:LONG_LINE: line over 80 characters
#1442: FILE: soc/arm/atmel_sam0/same54/dts_fixup.h:13:
+#define DT_NUM_IRQ_PRIO_BITS	DT_ARM_V7M_NVIC_E000E100_ARM_NUM_IRQ_PRIORITY_BITS

- total: 0 errors, 9 warnings, 1295 lines checked

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[galak]

Some DT related cleanups but otherwise looks good.