APIs and description changed for ACR

APIs and description changed for ACR

- enum name change : CSR_ENABLE -> CSR_STATE_ENABLE, CSR_DISABLE -> CSR_STATE_DISABLE
- error code change : CSR_ERROR_UNKNOWN -> CSR_ERROR_SYSTEM
- user_data parameter after other parameters in callback functions
- error description for error callback
- @pre tag added in async scanning method
- csr_cs_cancel_scanning description changed
- @detail tag right after @brief

Change-Id: Ib0c60f40a43fd14ba10e5f2758d1ebc7f3512e23
Signed-off-by: Dongsun Lee <ds73.lee@samsung.com>