spi/nuc900: Include linux/module.h

Include linux/module.h to fix below build error:

  CC      drivers/spi/spi-nuc900.o
drivers/spi/spi-nuc900.c:484: error: 'THIS_MODULE' undeclared here (not in a function)
drivers/spi/spi-nuc900.c:489: error: expected declaration specifiers or '...' before string constant
drivers/spi/spi-nuc900.c:489: warning: data definition has no type or storage class
drivers/spi/spi-nuc900.c:489: warning: type defaults to 'int' in declaration of 'MODULE_AUTHOR'
drivers/spi/spi-nuc900.c:489: warning: function declaration isn't a prototype
drivers/spi/spi-nuc900.c:490: error: expected declaration specifiers or '...' before string constant
drivers/spi/spi-nuc900.c:490: warning: data definition has no type or storage class
drivers/spi/spi-nuc900.c:490: warning: type defaults to 'int' in declaration of 'MODULE_DESCRIPTION'
drivers/spi/spi-nuc900.c:490: warning: function declaration isn't a prototype
drivers/spi/spi-nuc900.c:491: error: expected declaration specifiers or '...' before string constant
drivers/spi/spi-nuc900.c:491: warning: data definition has no type or storage class
drivers/spi/spi-nuc900.c:491: warning: type defaults to 'int' in declaration of 'MODULE_LICENSE'
drivers/spi/spi-nuc900.c:491: warning: function declaration isn't a prototype
drivers/spi/spi-nuc900.c:492: error: expected declaration specifiers or '...' before string constant
drivers/spi/spi-nuc900.c:492: warning: data definition has no type or storage class
drivers/spi/spi-nuc900.c:492: warning: type defaults to 'int' in declaration of 'MODULE_ALIAS'
drivers/spi/spi-nuc900.c:492: warning: function declaration isn't a prototype
make[2]: *** [drivers/spi/spi-nuc900.o] Error 1
make[1]: *** [drivers/spi] Error 2
make: *** [drivers] Error 2

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>