Generate a hwdb instead of udev rules

We only use the rules/hwdb to enable auto-suspend. So, instead of
shipping our own rules, we can just use the existing autosuspend rules
and ship a hwdb that sets the appropriate flag.

Closes: #336

meson.build

@@ -175,11 +175,11 @@ drivers_type_func += '}'
 root_inc = include_directories('.')
 
 if get_option('udev_rules')
-    udev_rules_dir = get_option('udev_rules_dir')
+    udev_hwdb_dir = get_option('udev_hwdb_dir')
 
-    if udev_rules_dir == 'auto'
+    if udev_hwdb_dir == 'auto'
         udev_dep = dependency('udev')
-        udev_rules_dir = udev_dep.get_pkgconfig_variable('udevdir') + '/rules.d'
+        udev_hwdb_dir = udev_dep.get_pkgconfig_variable('udevdir') + '/hwdb.d'
     endif
 endif