lshal --init-vintf stripped <impl> tag.

<impl> tag is deprecated from the manifest.

Test: lshal --init-vintf
Change-Id: Ifa9336e3dfe7f1091ee61aa6a10df9629ad98b49
diff --git a/cmds/lshal/Lshal.cpp b/cmds/lshal/Lshal.cpp
index 420ec3c..4c57361 100644
--- a/cmds/lshal/Lshal.cpp
+++ b/cmds/lshal/Lshal.cpp
@@ -301,7 +301,6 @@
                 if (!manifest.add(vintf::ManifestHal{
                     .format = vintf::HalFormat::HIDL,
                     .name = fqName.package(),
-                    .impl = {.implLevel = vintf::ImplLevel::GENERIC, .impl = ""},
                     .transportArch = {transport, arch}
                 })) {
                     mErr << "Warning: cannot add hal '" << fqInstanceName << "'" << std::endl;