add dependancy of determine-reboot-cause sevice to process-reboot-cause service (#11213)

Why I did it
Database container takes long time ( more than 1.5 minutes ) on some vendor platforms.
This makes the determine-reboot-cause starts later than process-reboot-cause service.
And that results in the incorrect reboot-cause determination.

How I did it
Add the dependency of determine-reboot-cause service to process-reboot-cause service

Author: sujinmkang

src/sonic-host-services-data/debian/sonic-host-services-data.process-reboot-cause.service

@@ -1,7 +1,7 @@
 [Unit]
 Description=Retrieve the reboot cause from the history files and save them to StateDB
-Requires=database.service
-After=database.service
+Requires=database.service determine-reboot-cause.service
+After=database.service determine-reboot-cause.service
 
 [Service]
 Type=simple