[TOPIC-GPIO] drivers: gpio_sx1509b: update to use new GPIO API

[pabigot]

Convert the SX1509B driver to the new API.

This also includes general cleanup to the driver as it's based on work that had been done for #11880.

This driver does not pass gpio_api_1pin. See #19692.

[zephyrbot]

All checks are passing now.

checkpatch (informational only, not a failure)

-:430: WARNING:LONG_LINE: line over 80 characters
#430: FILE: drivers/gpio/gpio_sx1509b.c:267:
+	int rc = i2c_reg_write_word_be(drv_data->i2c_master, cfg->i2c_slave_addr,

-:438: WARNING:LONG_LINE: line over 80 characters
#438: FILE: drivers/gpio/gpio_sx1509b.c:275:
+	LOG_DBG("write %04x msk %04x val %04x => %04x: %d", orig_out, mask, value, out, rc);

- total: 0 errors, 2 warnings, 658 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Your patch has style problems, please review.

NOTE: Ignored message types: AVOID_EXTERNS BRACES CONFIG_EXPERIMENTAL CONST_STRUCT DATE_TIME FILE_PATH_CHANGES MINMAX NETWORKING_BLOCK_COMMENT_STYLE PRINTK_WITHOUT_KERN_LEVEL SPLIT_STRING VOLATILE

NOTE: If any of the errors are false positives, please report
      them to the maintainers.

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[mnkp]

LGTM with minor comments.

[pabigot]

@mnkp all requests should be addressed ; see the last force-push for diffs.