Remove unnecessary base_dir property value overrides

base_dir property value defaults to the name of the partition, in
generateFsProps, and does not need to be overriden unless the value
differs from the name of the partition.

Test: m soong_generated_system_filesystem_test
Change-Id: I60165905beb48745158310d8904d649d49767ce0
diff --git a/fsgen/filesystem_creator.go b/fsgen/filesystem_creator.go
index d46f679..c0c18d8 100644
--- a/fsgen/filesystem_creator.go
+++ b/fsgen/filesystem_creator.go
@@ -175,7 +175,6 @@
 				Name:   proptools.StringPtr("system/lib/modules"),
 			},
 		}
-		fsProps.Base_dir = proptools.StringPtr("system")
 	case "system_ext":
 		fsProps.Fsverity.Inputs = []string{
 			"framework/*",
@@ -197,7 +196,6 @@
 				Name:   proptools.StringPtr("vendor/lib/modules"),
 			},
 		}
-		fsProps.Base_dir = proptools.StringPtr("vendor")
 	case "odm":
 		fsProps.Symlinks = []filesystem.SymlinkDefinition{
 			filesystem.SymlinkDefinition{
@@ -205,7 +203,6 @@
 				Name:   proptools.StringPtr("odm/lib/modules"),
 			},
 		}
-		fsProps.Base_dir = proptools.StringPtr("odm")
 	case "userdata":
 		fsProps.Base_dir = proptools.StringPtr("data")