Remove linkerconfig prop to linker_config

This makes this consistent with its inner props `gen_linker_config` and
`linker_config_srcs`

Test: m nothing --no-skip-soong-tests
Change-Id: I6efee5cc2d182af9c600ec80e3b02d1776ba8eb9
diff --git a/filesystem/filesystem_test.go b/filesystem/filesystem_test.go
index f284161..f325d96 100644
--- a/filesystem/filesystem_test.go
+++ b/filesystem/filesystem_test.go
@@ -161,7 +161,7 @@
 				"libfoo",
 				"libbar",
 			],
-			linkerconfig: {
+			linker_config: {
 				gen_linker_config: true,
 				linker_config_srcs: ["linker.config.json"],
 			},
@@ -227,7 +227,7 @@
 					deps: ["foo"],
 				},
 			},
-			linkerconfig: {
+			linker_config: {
 				gen_linker_config: true,
 				linker_config_srcs: ["linker.config.json"],
 			},
@@ -325,7 +325,7 @@
 			deps: [
 				"libfoo",
 			],
-			linkerconfig: {
+			linker_config: {
 				gen_linker_config: true,
 				linker_config_srcs: ["linker.config.json"],
 			},
@@ -709,7 +709,7 @@
 android_filesystem {
     name: "myfilesystem",
     deps: ["libfoo_has_no_stubs", "libfoo_has_stubs"],
-    linkerconfig: {
+    linker_config: {
         gen_linker_config: true,
         linker_config_srcs: ["linker.config.json"],
     },