patches/openwrt/kernel: Rename turris-omnia-mcu compatible to turris-omnia-ctrl

Last year we prepared U-Boot so that when the turris-omnia-mcu driver is finally in kernel, U-Boot will, before loading kernel, fixup Omnia's device-tree by injecting reset-gpios to PCIe nodes (for board revisions 32+).

Now that the device-tree contains the node with "cznic,turris-omnia-mcu" compatible, U-Boot does exactly that. But the problem is that the pci-mvebu driver with reset-gpios available fails to enumerate the ath10k card WLE900VX.

Rename the compatible of the driver to "cznic,turris-omnia-ctrl" so that U-Boot does not inject the reset-gpios for now.