hal: add support to compile audio hal for qcs405

Add platform and configure.ac changes to support audio hal
for qcs405 targets.

Change-Id: Ifa2c610420ef2e92729ef0dcd6eea09ae8c5cc70
diff --git a/configure.ac b/configure.ac
index d6775b2..d92c8bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,6 +85,10 @@
          AC_SUBST([TARGET_PLATFORM], ["msm8974"])
          TARGET_CFLAGS=" -DPLATFORM_QCS605"
 fi
+if (test x$TARGET_SUPPORT = xqcs40x); then
+         AC_SUBST([TARGET_PLATFORM], ["msm8974"])
+         TARGET_CFLAGS=" -DPLATFORM_QCS405"
+fi
 
 AC_SUBST([TARGET_CFLAGS])