rust: Allow rust sysprop libraries to be installed.

These libraries should be installable, otherwise the dylib won't
be installed to the device leading to runtime linker errors.

Bug: 380116147
Test: m <library w/ sysprop_library dep>; ls $OUT/system/lib64
Change-Id: Ieeff24d9c2f3bfa79e5f63c89e780b394716257d
diff --git a/sysprop/sysprop_library.go b/sysprop/sysprop_library.go
index 84f20c5..77d5853 100644
--- a/sysprop/sysprop_library.go
+++ b/sysprop/sysprop_library.go
@@ -680,7 +680,7 @@
 		Sysprop_srcs: m.properties.Srcs,
 		Scope:        scope,
 		Check_api:    proptools.StringPtr(ctx.ModuleName()),
-		Installable:  proptools.BoolPtr(false),
+		Installable:  m.properties.Installable,
 		Crate_name:   m.rustCrateName(),
 		Rustlibs: []string{
 			"liblog_rust",