ARM: DRA7: Kconfig: Make ARCH_NR_GPIO default to 512

DRA7xx has 8 GPIO banks so that there are 32x8 = 256 GPIOs.
In order for the gpiolib to detect and initialize these
and other TWL GPIOs, ARCH_NR_GPIO is set to 512 using the
kconfig default for DRA7.
Signed-off-by: NR Sricharan <r.sricharan@ti.com>
Signed-off-by: NRajendra Nayak <rnayak@ti.com>

arch/arm/Kconfig

@@ -1600,7 +1600,7 @@ config LOCAL_TIMERS
 config ARCH_NR_GPIO
 	int
 	default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
-	default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5
+	default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || SOC_DRA7XX
 	default 392 if ARCH_U8500
 	default 352 if ARCH_VT8500
 	default 288 if ARCH_SUNXI