kernel: disable CONFIG_USB_IMX21_HCD in default for kernel 4.14

CONFIG_USB_IMX21_HCD should be handled in generic config and
module package. So moved it into generic config.
This also fixed build issue (kernel config question) of layerscape
armv8_32b since it also used ARCH_MXC.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
[Deactivate CONFIG_USB_IMX21_HCD also for kernel 4.19]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/generic/config-4.14

@@ -5204,6 +5204,7 @@ CONFIG_USB_GADGET_VBUS_DRAW=2
 # CONFIG_USB_HUB_USB251XB is not set
 # CONFIG_USB_HWA_HCD is not set
 # CONFIG_USB_IDMOUSE is not set
+# CONFIG_USB_IMX21_HCD is not set
 # CONFIG_USB_IOWARRIOR is not set
 # CONFIG_USB_IPHETH is not set
 # CONFIG_USB_ISIGHTFW is not set

target/linux/generic/config-4.19

@@ -5459,6 +5459,7 @@ CONFIG_USB_GADGET_VBUS_DRAW=2
 # CONFIG_USB_HUB_USB251XB is not set
 # CONFIG_USB_HWA_HCD is not set
 # CONFIG_USB_IDMOUSE is not set
+# CONFIG_USB_IMX21_HCD is not set
 # CONFIG_USB_IOWARRIOR is not set
 # CONFIG_USB_IPHETH is not set
 # CONFIG_USB_ISIGHTFW is not set

target/linux/imx6/config-4.14

@@ -500,7 +500,6 @@ CONFIG_USB_EHCI_HCD=y
 # CONFIG_USB_EHCI_HCD_PLATFORM is not set
 # CONFIG_USB_EHCI_MXC is not set
 CONFIG_USB_GADGET=y
-# CONFIG_USB_IMX21_HCD is not set
 CONFIG_USB_MXS_PHY=y
 CONFIG_USB_OTG=y
 CONFIG_USB_PHY=y