[sms] Fix compile warning by including gsm_data.h

In file included from sms_test.c:27:
../../include/openbsc/gsm_utils.h:33: warning: `enum gsm_band' declared inside parameter list
../../include/openbsc/gsm_utils.h:33: warning: its scope is only this definition or declaration, which is probably not what you want
../../include/openbsc/gsm_utils.h:34: warning: `enum gsm_band' declared inside parameter list
1 file changed
tree: 8e58bd658a728df6758bed05b4d453498083b4c9
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/