The driver can be compile tested with !CONFIG_OF making certain data
unused:
drivers/spi/spi-bcm-qspi.c:1460:34: error: ‘bcm_qspi_of_match’ defined but not used [-Werror=unused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>