spi.c:undefined reference to `nci_spi_send'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   27eb427bdc0960ad64b72da03e3596c801e7a9e9
commit: caf6e49bf6d02e6bb94df680bbe3beaf680fdefa NFC: nfcmrvl: add spi driver
date:   12 days ago
config: i386-randconfig-x001-201545 (attached as .config)
reproduce:
        git checkout caf6e49bf6d02e6bb94df680bbe3beaf680fdefa
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `nfcmrvl_spi_nci_send':
>> spi.c:(.text+0x3a3490): undefined reference to `nci_spi_send'
   drivers/built-in.o: In function `nfcmrvl_spi_probe':
>> spi.c:(.text+0x3a3565): undefined reference to `nci_spi_allocate_spi'
   drivers/built-in.o: In function `nfcmrvl_spi_int_irq_thread_fn':
>> spi.c:(.text+0x3a3601): undefined reference to `nci_spi_read'

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