fix: remove [service] sections from .target init files in P4 patch

The init system parser (serde deny_unknown_fields) rejects [service]
sections in .target files. The P4-initfs-dbus-services patch was
creating 05_boot_essential.target and 12_boot_late.target with a
no-op [service] section (cmd=/usr/bin/true). Removed those sections
so targets only contain [unit].

This eliminates "unknown field service, expected unit" init warnings
that could prevent proper service dependency resolution.

local/patches/base/P4-initfs-dbus-services.patch

@@ -1,23 +1,15 @@
 --- /dev/null
 +++ b/init.d/05_boot_essential.target
-@@ -0,0 +1,7 @@
+@@ -0,0 +1,3 @@
 +[unit]
 +description = "Boot essential services target"
 +requires_weak = ["00_base.target"]
-+
-+[service]
-+cmd = "/usr/bin/true"
-+type = "oneshot"
 --- /dev/null
 +++ b/init.d/12_boot_late.target
-@@ -0,0 +1,7 @@
+@@ -0,0 +1,3 @@
 +[unit]
 +description = "Boot late stage target"
 +requires_weak = ["05_boot_essential.target"]
-+
-+[service]
-+cmd = "/usr/bin/true"
-+type = "oneshot"
 --- /dev/null
 +++ b/init.d/12_dbus.service
 @@ -0,0 +1,8 @@