Remove missing files from Makefile.am so make dist will succeed

This commit was SVN r20743.

ompi/mca/btl/pcie/Makefile.am

@@ -37,9 +37,7 @@ sources = \
     btl_pcie_proc.h \
     btl_pcie_lex.c \
     btl_pcie_lex.h \
-    btl_pcie_cfg.c \
+    btl_pcie_cfg.c
-    btl_pcie_ddriver.h \
-    btl_pcie_ddriver.c
 
 EXTRA_DIST = btl_pcie_lex.l