qcacld-3.0: Fix -Wmissing-prototypes in PLD

We want to enable the compiler's -Wmissing-prototypes switch, but
there is existing code that is generating warnings. Fix all warnings
in core/pld.

Change-Id: Icef77666d1d1ef214491dcf1fcd56741091cec4f
CRs-Fixed: 1078826
diff --git a/core/pld/src/pld_pcie.c b/core/pld/src/pld_pcie.c
index f954981..ada4fd1 100644
--- a/core/pld/src/pld_pcie.c
+++ b/core/pld/src/pld_pcie.c
@@ -36,6 +36,7 @@
 #endif
 
 #include "pld_internal.h"
+#include "pld_pcie.h"
 
 #ifdef CONFIG_PCI