src: Bump MAX_MNT_ELEMENTS for new 'dmem' controller

Upstream commit b168ed458ddec ("kernel/cgroup: Add 'dmem' memory
accounting cgroup") adds a new controller. Update MAX_MNT_ELEMENTS
to match the increased number of cgroup controllers.

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>

Author: kamalesh-babulal

src/libcgroup-internal.h

@@ -27,7 +27,7 @@ extern "C" {
 #include <sys/stat.h>
 #include <sys/types.h>
 
-#define MAX_MNT_ELEMENTS	16	/* Maximum number of mount points/controllers */
+#define MAX_MNT_ELEMENTS	17	/* Maximum number of mount points/controllers */
 #define MAX_GROUP_ELEMENTS	128	/* Estimated number of groups created */
 
 #define CG_CONTROL_VALUE_MAX	4096	/* Maximum length of a value */