[2/3] spi: add FTDI MPSSE SPI controller driver

[kbuild test robot <lkp@intel.com>]

Hi Anatolij,

I love your patch! Yet something to improve:

[auto build test ERROR on usb/usb-testing]
[also build test ERROR on v4.20-rc1 next-20181105]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Anatolij-Gustschin/Add-support-for-ARRI-FPGA-configuration/20181106-090458
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: i386-allyesconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> drivers//spi/spi-ftdi-mpsse.c:27:2: error: expected identifier before numeric constant
     CS = BIT(3),
     ^~

vim +27 drivers//spi/spi-ftdi-mpsse.c

    22	
    23	enum gpiol {
    24		SK	= BIT(0),
    25		DO	= BIT(1),
    26		DI	= BIT(2),
  > 27		CS	= BIT(3),
    28	};
    29
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