staging: intel_sst: fix compile error

include module.h to fix the following compile errors:

drivers/staging/intel_sst/intelmid.c:52: error: expected declaration specifiers or '...' before string constant
drivers/staging/intel_sst/intelmid.c:52: warning: data definition has no type or storage class
drivers/staging/intel_sst/intelmid.c:52: warning: type defaults to 'int' in declaration of 'MODULE_AUTHOR'
drivers/staging/intel_sst/intelmid.c:52: warning: function declaration isn't a prototype
drivers/staging/intel_sst/intelmid.c:53: error: expected declaration specifiers or '...' before string constant
drivers/staging/intel_sst/intelmid.c:53: warning: data definition has no type or storage class
drivers/staging/intel_sst/intelmid.c:53: warning: type defaults to 'int' in declaration of 'MODULE_AUTHOR'
drivers/staging/intel_sst/intelmid.c:53: warning: function declaration isn't a prototype
drivers/staging/intel_sst/intelmid.c:54: error: expected declaration specifiers or '...' before string constant
drivers/s...