numastat: Add SecPageTables to list of known fields in meminfo

Linux kernel added this new field in August 2020 with commit:

  ebc97a52b5d6c("mm: add NR_SECONDARY_PAGETABLE to count secondary page table uses.")

Add it to numastat too.

numastat.c

@@ -115,21 +115,22 @@ static meminfo_t system_meminfo[] = {
         { 21, "KernelStack", "KernelStack" },
         { 22, "ShadowCallStack", "ShadowCallStack" },
         { 23, "PageTables", "PageTables" },
-        { 24, "NFS_Unstable", "NFS_Unstable" },
-        { 25, "Bounce", "Bounce" },
-        { 26, "WritebackTmp", "WritebackTmp" },
-        { 27, "Slab", "Slab" },
-        { 28, "SReclaimable", "SReclaimable" },
-        { 29, "SUnreclaim", "SUnreclaim" },
-        { 30, "AnonHugePages", "AnonHugePages" },
-        { 31, "ShmemHugePages", "ShmemHugePages" },
-        { 32, "ShmemPmdMapped", "ShmemPmdMapped" },
-        { 33, "FileHugePages", "FileHugePages" },
-        { 34, "FilePmdMapped", "FilePmdMapped" },
-        { 35, "HugePages_Total", "HugePages_Total" },
-        { 36, "HugePages_Free", "HugePages_Free" },
-        { 37, "HugePages_Surp", "HugePages_Surp" },
-        { 38, "KReclaimable", "KReclaimable" }
+        { 24, "SecPageTables", "SecPageTables" },
+        { 25, "NFS_Unstable", "NFS_Unstable" },
+        { 26, "Bounce", "Bounce" },
+        { 27, "WritebackTmp", "WritebackTmp" },
+        { 28, "Slab", "Slab" },
+        { 29, "SReclaimable", "SReclaimable" },
+        { 30, "SUnreclaim", "SUnreclaim" },
+        { 31, "AnonHugePages", "AnonHugePages" },
+        { 32, "ShmemHugePages", "ShmemHugePages" },
+        { 33, "ShmemPmdMapped", "ShmemPmdMapped" },
+        { 34, "FileHugePages", "FileHugePages" },
+        { 35, "FilePmdMapped", "FilePmdMapped" },
+        { 36, "HugePages_Total", "HugePages_Total" },
+        { 37, "HugePages_Free", "HugePages_Free" },
+        { 38, "HugePages_Surp", "HugePages_Surp" },
+        { 39, "KReclaimable", "KReclaimable" }
 };
 
 #define SYSTEM_MEMINFO_ROWS (sizeof(system_meminfo) / sizeof(system_meminfo[0]))