vintf: VendorManifest -> HalManifest

VendorManifest is an old name and is changed
to HalManifest long ago in relavant documentation.
It merely consist of a list of "HALs" and doesn't
contain any runtime collectible information.

Test: mma
Test: libvintf_test

Change-Id: Iba78128c194a3efc34371b686943266829d8e33c
diff --git a/parse_string.cpp b/parse_string.cpp
index 75d48e2..2e1714f 100644
--- a/parse_string.cpp
+++ b/parse_string.cpp
@@ -347,7 +347,7 @@
     return true;
 }
 
-std::string dump(const VendorManifest &vm) {
+std::string dump(const HalManifest &vm) {
     std::ostringstream oss;
     bool first = true;
     for (const auto &hal : vm.getHals()) {