[xlnx:master 841/1043] core.c:undefined reference to `dwc3_set_simple_data'

[kbuild test robot]

tree:   https://github.com/Xilinx/linux-xlnx master
head:   f1b1e077d641fc83b54c1b8f168cbb58044fbd4e
commit: a4769f84c50a769e655d4bb9c1a8a45586cdc1f4 [841/1043] dwc3: Add support for removing vbus when suspended
config: i386-randconfig-s0-10032350 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout a4769f84c50a769e655d4bb9c1a8a45586cdc1f4
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `dwc3_core_init':
>> core.c:(.text+0x24776d): undefined reference to `dwc3_set_simple_data'
   core.c:(.text+0x2477a3): undefined reference to `dwc3_enable_hw_coherency'
   drivers/built-in.o: In function `dwc3_probe':
   core.c:(.text+0x248cf3): undefined reference to `dwc3_set_phydata'
   core.c:(.text+0x248d8c): undefined reference to `dwc3_set_phydata'

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