ath79: add missing GPIO_LATCH symbol

Fixes commit 7b8931678c36 ("ath79: add gpio-latch driver for MikroTik RouterBOARDs")

Signed-off-by: David Bauer <[email protected]>

target/linux/ath79/config-5.10

@@ -72,6 +72,7 @@ CONFIG_GPIOLIB_IRQCHIP=y
 CONFIG_GPIO_74X164=y
 CONFIG_GPIO_ATH79=y
 CONFIG_GPIO_GENERIC=y
+# CONFIG_GPIO_LATCH is not set
 CONFIG_HANDLE_DOMAIN_IRQ=y
 CONFIG_HARDWARE_WATCHPOINTS=y
 CONFIG_HAS_DMA=y

target/linux/ath79/config-5.4

@@ -90,6 +90,7 @@ CONFIG_GPIOLIB_IRQCHIP=y
 CONFIG_GPIO_74X164=y
 CONFIG_GPIO_ATH79=y
 CONFIG_GPIO_GENERIC=y
+# CONFIG_GPIO_LATCH is not set
 CONFIG_HANDLE_DOMAIN_IRQ=y
 CONFIG_HARDWARE_WATCHPOINTS=y
 CONFIG_HAS_DMA=y