pass: Remove unnecessary installed service files

pass: Remove unnecessary installed service files

The dbus activation service files are not necessary in systemd
unitdir. Remove unnecessary installation of dbus activation
service files.

This removes below packaging warning message:
   warning: Installed (but unpackaged) file(s) found:
      /usr/lib/systemd/system/org.tizen.system.pass.service
      /usr/lib/systemd/system/org.tizen.system.thermal.service

Change-Id: I5c13e31032b07db7ac11271ad5f231737383b0f8
Fixes: commit d0b00031fc66 ("core: Add support for dbus activation for thermal")
Fixes: commit da1dc2ab2a66 ("core: Apply systemd-based dbus activation")
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>