treewide: remove dependencies on mapper.target

The mapper is dbus activated now, so these explicit dependency
declarations are unnecessary and redundant.

Change-Id: I2d4c0eb4e4bd88f3a13929b4fd9fd435250be156
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/service_files/phosphor-button-handler.service b/service_files/phosphor-button-handler.service
index de79594..dd65915 100644
--- a/service_files/phosphor-button-handler.service
+++ b/service_files/phosphor-button-handler.service
@@ -2,8 +2,6 @@
 Description=Phosphor Button Handler
 Wants=xyz.openbmc_project.Chassis.Buttons.service
 After=xyz.openbmc_project.Chassis.Buttons.service
-Wants=obmc-mapper.target
-After=obmc-mapper.target
 
 [Service]
 Restart=always