drivers/dca: Add export.h for THIS_MODULE to dca-sysfs.c
drivers/dca: Add export.h for THIS_MODULE to dca-sysfs.c

Ensure we have access to the THIS_MODLUE macro once we clean up
the implicit module.h usage.

Signed-off-by: Paul Gortmaker <ae947f3c8df96e1dc851c5e3e5a930ce6d3f1f74@windriver.com>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs