gpio: palmas: fix implicit assumption module.h is present

This file is currently getting module.h from a global gpio header
and it will fail to build once we remove module.h from that.

However, the driver is controlled with the following Kconfig:

drivers/gpio/Kconfig:config GPIO_PALMAS
drivers/gpio/Kconfig: bool "TI PALMAS series PMICs GPIO"

and hence the line of MODULE_DEVICE_TABLE is a no-op that can simply
be deleted. In fact it should have been removed in an earlier commit
that did demodularization, however the unseen include prevented my
build testing from detecting it.

Cc: Linus Walleij <[e-mail]>
Cc: Alexandre Courbot <[e-mail]>
Cc: [e-mail]
Signed-off-by: Paul Gortmaker <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-palmas.c

···
 	{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
 	{ },
 };
-MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);
 
 static int palmas_gpio_probe(struct platform_device *pdev)
 {