Change include style to use system includes

The libcper header files in `libcper` are installed to
`usr/include/libcper`. Use that system includes in `libcper` source
instead of using the project includes.

Change-Id: I596edc2c754dae4829844f535a1e34caa246fb43
Signed-off-by: Thu Nguyen <thu@os.amperecomputing.com>
diff --git a/generator/sections/gen-section-pci-dev.c b/generator/sections/gen-section-pci-dev.c
index 58ae95e..999739a 100644
--- a/generator/sections/gen-section-pci-dev.c
+++ b/generator/sections/gen-section-pci-dev.c
@@ -5,9 +5,9 @@
  **/
 
 #include <stdlib.h>
-#include "../../BaseTypes.h"
-#include "../gen-utils.h"
-#include "gen-section.h"
+#include <libcper/BaseTypes.h>
+#include <libcper/generator/gen-utils.h>
+#include <libcper/generator/sections/gen-section.h>
 
 //Generates a single pseudo-random PCI component error section, saving the resulting address to the given
 //location. Returns the size of the newly created section.