arm64: defconfig: enable i.mx 8m plus specific interconnect support

Build CONFIG_INTERCONNECT_IMX8MP as a kernel module without which one
may get the following after boot:

[   15.728019] platform 32f10100.usb: deferred probe pending
[   15.733471] platform 32f10108.usb: deferred probe pending
[   15.738895] platform 381f0040.usb-phy: deferred probe pending
[   15.744668] platform 382f0040.usb-phy: deferred probe pending
[   15.750437] platform 33800000.pcie: deferred probe pending
[   15.755944] platform 32ec0000.blk-ctrl: deferred probe pending
[   15.761807] platform 38330000.blk-ctrl: deferred probe pending
[   15.767673] platform 32f10000.blk-ctrl: deferred probe pending

And things like PCIe and/or USB stop working.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -1294,6 +1294,7 @@ CONFIG_INTERCONNECT_IMX=m
 CONFIG_INTERCONNECT_IMX8MM=m
 CONFIG_INTERCONNECT_IMX8MN=m
 CONFIG_INTERCONNECT_IMX8MQ=m
+CONFIG_INTERCONNECT_IMX8MP=m
 CONFIG_INTERCONNECT_QCOM=y
 CONFIG_INTERCONNECT_QCOM_MSM8916=m
 CONFIG_INTERCONNECT_QCOM_MSM8996=m