The arm64 allmodconfig build failed on Linux next 20210617 tag due to
the commit,

c950686b382d ("usb: host: xhci-plat: Create platform device for
onboard hubs in probe()")

build error:
------------
aarch64-linux-gnu-ld: drivers/usb/host/xhci-plat.o: in function
`xhci_plat_remove':
drivers/usb/host/xhci-plat.c:427: undefined reference to
`onboard_hub_destroy_pdevs'
drivers/usb/host/xhci-plat.c:427:(.text+0x82c): relocation truncated
to fit: R_AARCH64_CALL26 against undefined symbol
`onboard_hub_destroy_pdevs'
aarch64-linux-gnu-ld: drivers/usb/host/xhci-plat.o: in function
`xhci_plat_probe':
drivers/usb/host/xhci-plat.c:379: undefined reference to
`onboard_hub_create_pdevs'
drivers/usb/host/xhci-plat.c:379:(.text+0x131c): relocation truncated
to fit: R_AARCH64_CALL26 against undefined symbol
`onboard_hub_create_pdevs'
make[1]: *** [Makefile:1252: vmlinux] Error 1
make[1]: Target '__all' not remade because of errors.
make: *** [Makefile:222: __sub-make] Error 2
make: Target '__all' not remade because of errors.

steps to reproduce:
--------------------
tuxmake --runtime=podman --toolchain=gcc-11 --target=arm64 --kconfig
allmodconfig KCONFIG_ALLCONFIG=arch/arm64/configs/defconfig kernel
modules

Build:
--------
    git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
    git_sha: 7d9c6b8147bdd76d7eb2cf6f74f84c6918ae0939
    git_short_log: 7d9c6b8147bd (\Add linux-next specific files for 20210617\)
    arch: arm64
    config: allmodconfig
    toolchain: gcc-11

Reported-by: Naresh Kamboju <redacted>

--
Linaro LKFT
https://lkft.linaro.org