Make the order of the header file includes consistent in backend modules.

Similar to commits 7e735035f2 and dddf4cdc33, this commit makes the order
of header file inclusion consistent for backend modules.

In the passing, removed a couple of duplicate inclusions.

Author: Vignesh C
Reviewed-by: Kuntal Ghosh and Amit Kapila
Discussion: https://postgr.es/m/CALDaNm2Sznv8RR6Ex-iJO6xAdsxgWhCoETkaYX=+9DW3q0QCfA@mail.gmail.com

src/backend/access/hash/hash.c

@@ -31,8 +31,6 @@
 #include "utils/builtins.h"
 #include "utils/index_selfuncs.h"
 #include "utils/rel.h"
-#include "miscadmin.h"
-
 
 /* Working state for hashbuild and its callback */
 typedef struct

src/backend/access/hash/hash_xlog.c

@@ -17,11 +17,11 @@
 #include "access/bufmask.h"
 #include "access/hash.h"
 #include "access/hash_xlog.h"
-#include "access/xlogutils.h"
-#include "access/xlog.h"
 #include "access/transam.h"
-#include "storage/procarray.h"
+#include "access/xlog.h"
+#include "access/xlogutils.h"
 #include "miscadmin.h"
+#include "storage/procarray.h"
 
 /*
  * replay a hash index meta page

src/backend/access/hash/hashinsert.c

@@ -18,10 +18,10 @@
 #include "access/hash.h"
 #include "access/hash_xlog.h"
 #include "miscadmin.h"
-#include "utils/rel.h"
-#include "storage/lwlock.h"
 #include "storage/buf_internals.h"
+#include "storage/lwlock.h"
 #include "storage/predicate.h"
+#include "utils/rel.h"
 
 static void _hash_vacuum_one_page(Relation rel, Relation hrel,
 								  Buffer metabuf, Buffer buf);

src/backend/access/hash/hashpage.c

@@ -32,9 +32,8 @@
 #include "access/hash_xlog.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
-#include "storage/smgr.h"
 #include "storage/predicate.h"
-
+#include "storage/smgr.h"
 
 static bool _hash_alloc_buckets(Relation rel, BlockNumber firstblock,
 								uint32 nblocks);

src/backend/access/hash/hashsearch.c

@@ -18,8 +18,8 @@
 #include "access/relscan.h"
 #include "miscadmin.h"
 #include "pgstat.h"
-#include "utils/rel.h"
 #include "storage/predicate.h"
+#include "utils/rel.h"
 
 static bool _hash_readpage(IndexScanDesc scan, Buffer *bufP,
 						   ScanDirection dir);

src/backend/access/hash/hashutil.c

@@ -17,9 +17,9 @@
 #include "access/hash.h"
 #include "access/reloptions.h"
 #include "access/relscan.h"
+#include "storage/buf_internals.h"
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
-#include "storage/buf_internals.h"
 
 #define CALC_NEW_BUCKET(old_bucket, lowmask) \
 			old_bucket | (lowmask + 1)