kbuild: warning with cavium_octeon_defconfig

[EUNBONG SONG <eunb.song@xxxxxxxxxxx>]

Hello. 
Every time i config with arch/mips/configs/cavium_octeon_defconfig, the following warning messages are showed.
warning: (MIPS_SEAD3 && PMC_MSP && CPU_CAVIUM_OCTEON) selects USB_EHCI_BIG_ENDIAN_MMIO which has unmet direct dependencies (USB_SUPPORT && USB && USB_EHCI_HCD)
warning: (MIPS_SEAD3 && PMC_MSP && CPU_CAVIUM_OCTEON) selects USB_EHCI_BIG_ENDIAN_MMIO which has unmet direct dependencies (USB_SUPPORT && USB && USB_EHCI_HCD)


I guess it caused by commit id: 9296d94d83649e1c2f25c87dc4ead9c2ab073305 

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