Remove SMACK rule file(.rule) according three domain model

Remove SMACK rule file(.rule) according three domain model

Since SMACK only allows three labels, "_"(floor), "User", "System"
The labels of current rule file are not appropriate

Solution:
- Remove rule file (org.tizen.clock.rule)
- Remove install statement about installing rule file described in CMakeLists.txt
- Remove file path and name declaration of spec file (packaging/org.tizen.clock.spec)

Change-Id: I4eedcfa4a05ba499df97aa94ccbf992e381b6e6b
Signed-off-by: seong.chung <seong.chung@samsung.com>