Use the bank name as the irqchip name. This name is later visible in
/proc/interrupts, what makes it possible to easily identify each
GPIO interrupt.

/proc/interrupts before this patch:
143:    0     exynos4210_wkup_irq_chip   7 Edge      hdmi
144:    0     exynos4210_wkup_irq_chip   6 Level     wm8994
145:    1     exynos4210_wkup_irq_chip   7 Edge      max77686-pmic, max77686-rtc
146:    1     exynos_gpio_irq_chip   3 Edge      3-0048

/proc/interrupts after this patch:
143:    0     gpx3   7 Edge      hdmi
144:    0     gpx3   6 Level     wm8994
145:    1     gpx0   7 Edge      max77686-pmic, max77686-rtc
146:    1     gpm2   3 Edge      3-0048

Handling of the eint_wake_mask_value has been reworked, because each bank
has now its own exynos_irq_chip structure allocated.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200720145412.24221-1-krzk@kernel.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>