[TOPIC-GPIO] gpio: gecko: Add init macro and support for more ports

[chrta]

This introduces a macro to initialize gpio ports to the gecko gpio driver. This macro simplified adding support for port g to port k.
These ports are also added to the efr32mg12p soc dtsi file.
Port k will actually be used in the pull request #20194 which adds a basic spi driver to the efr32mg board that connects to a spi nor flash.

[zephyrbot]

All checks passed.

checkpatch (informational only, not a failure)

-:281: WARNING:LONG_LINE: line over 80 characters
#281: FILE: soc/arm/silabs_exx32/efr32mg12p/dts_fixup.h:29:
+#define DT_GPIO_GECKO_PORTI_NAME	DT_SILABS_EFR32MG_GPIO_PORT_4000A180_LABEL

-:282: WARNING:LONG_LINE: line over 80 characters
#282: FILE: soc/arm/silabs_exx32/efr32mg12p/dts_fixup.h:30:
+#define DT_GPIO_GECKO_PORTJ_NAME	DT_SILABS_EFR32MG_GPIO_PORT_4000A1B0_LABEL

-:283: WARNING:LONG_LINE: line over 80 characters
#283: FILE: soc/arm/silabs_exx32/efr32mg12p/dts_fixup.h:31:
+#define DT_GPIO_GECKO_PORTK_NAME	DT_SILABS_EFR32MG_GPIO_PORT_4000A1E0_LABEL

- total: 0 errors, 3 warnings, 265 lines checked

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[galak]

Its probably best this was done against the 'topic-gpio' branch.

[chrta]

@galak OK, i will change the target branch to topic-gpio

[galak]

Sorry, because of the branch changes, a lot of reviewers were requested automatically. Should i delete them manually?
Now the target branch is topic-gpio.

I updated the reviewers list.