kernel: Deactivate CONFIG_VFIO in generic kernel config

Instead of deactivating this in every target config, deactivate it once
in the generic kernel config. I was asked for this config option in a
x86 64 build in OpenWrt 21.02.

Fixes: 87046e87e2 ("kernel: add missing kernel config symbol")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/config-5.4

@@ -6259,6 +6259,7 @@ CONFIG_VDSO=y
 # CONFIG_VF610_ADC is not set
 # CONFIG_VF610_DAC is not set
 # CONFIG_VFAT_FS is not set
+# CONFIG_VFIO is not set
 # CONFIG_VGASTATE is not set
 # CONFIG_VGA_ARB is not set
 # CONFIG_VGA_SWITCHEROO is not set

target/linux/rockchip/armv8/config-5.10

@@ -645,7 +645,6 @@ CONFIG_USB_ULPI_VIEWPORT=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_PLATFORM=y
 # CONFIG_USERIO is not set
-# CONFIG_VFIO is not set
 # CONFIG_VIRTIO_MENU is not set
 CONFIG_VMAP_STACK=y
 CONFIG_VM_EVENT_COUNTERS=y

target/linux/rockchip/armv8/config-5.4

@@ -617,7 +617,6 @@ CONFIG_USB_ULPI_VIEWPORT=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_PLATFORM=y
 # CONFIG_USERIO is not set
-# CONFIG_VFIO is not set
 # CONFIG_VIRTIO_MENU is not set
 CONFIG_VMAP_STACK=y
 CONFIG_VM_EVENT_COUNTERS=y

target/linux/tegra/config-5.4

@@ -553,7 +553,6 @@ CONFIG_USB_ULPI=y
 CONFIG_USB_ULPI_VIEWPORT=y
 # CONFIG_USERIO is not set
 CONFIG_USE_OF=y
-# CONFIG_VFIO is not set
 CONFIG_VFP=y
 CONFIG_VFPv3=y
 CONFIG_WATCHDOG_CORE=y