Replace $(call my-dir) with a string literal

This is so that we can set LOCAL_PATH to the result
of my-dir, as LOCAL_PATH can only be set to a string
literal of the exact value of LOCAL_PATH.

It's probably also the correct choice to start phasing
out LOCAL_PATH.

Bug: 214405650
Test: go test
Change-Id: Ia97d7fedf4ce62643921d90a176e65edd4e2fce6

mk2rbc/mk2rbc_test.go

@@ -1451,6 +1451,19 @@ def init(g, handle):
   rblf.mk2rbc_error("product.mk:19", "type_hint annotations must come before the first Makefile statement")
   g["MY_VAR_4"] = "foo"
   _my_local_var_with_dashes = ["foo"]
+`,
+	},
+	{
+		desc:   "Set LOCAL_PATH to my-dir",
+		mkname: "product.mk",
+		in: `
+LOCAL_PATH := $(call my-dir)
+`,
+		expected: `load("//build/make/core:product_config.rbc", "rblf")
+
+def init(g, handle):
+  cfg = rblf.cfg(handle)
+  
 `,
 	},
 }