[TOPIC-GPIO] update sam0 driver

[pabigot]

Tested on SAM-D21-Xplained Pro with 2-pin test, blinky, and button.

Checked D20 and R21 data sheets, there should be no incompatibilities.

[zephyrbot]

All checks passed.

checkpatch (informational only, not a failure)

-:396: WARNING:LONG_LINE: line over 80 characters
#396: FILE: drivers/gpio/gpio_sam0.c:253:
+					      (DEV_DATA(dev)->debounce & BIT(pin)) != 0,

- total: 0 errors, 1 warnings, 444 lines checked

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[pabigot]

@mnkp This does not pass the (updated) 1-pin test for interrupts. I believe that's because on SAM0 a pin that is configured for interrupts is set for an alternate pinmux function (EIC) and cannot be set with the GPIO interface.

Although I've confirmed that setting and clearing the pin results in a change in the input value before gpio_pin_interrupt_configure(), while the interrupts are configured no changes to the input value can be detected through the GPIO interface, and only one interrupt is ever signaled in the loop that toggles the GPIO.

The two pin interrupt tests pass.

[jfischer-no]

Tested on samr21xpro with tests/drivers/gpio/gpio_basic_api, blinky and button samples. ✔️ LGTM