gpio: davinci: Remove unused member of davinci_gpio_controller

This was added as part of the patch in the fixes below, but was
not needed or used, remove this here.

Fixes: 8e11047b ("gpio: davinci: Add support for multiple GPIO controllers")
Tested-by: Keerthy <j-keerthy@ti.com>
Acked-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

include/linux/platform_data/gpio-davinci.h

@@ -43,7 +43,6 @@ struct davinci_gpio_controller {
 	void __iomem		*regs[MAX_REGS_BANKS];
 	int			gpio_unbanked;
 	int			irqs[MAX_INT_PER_BANK];
-	unsigned int		base;
 };
 
 /*