Fix compile errors caused by implict includes and casts

There was some missing includes and implicit casts in the
code what caused compile errors with new gcc, this commit fixes them.

arch/arm/mmu.c

@@ -26,6 +26,7 @@
 #include <arch.h>
 #include <arch/arm.h>
 #include <arch/defines.h>
+#include <arch/ops.h>
 #include <arch/arm/mmu.h>
 #include <platform.h>
 

kernel/main.c

@@ -29,6 +29,8 @@
 #include <arch.h>
 #include <platform.h>
 #include <target.h>
+#include <lib/bio.h>
+#include <lib/fs.h>
 #include <lib/heap.h>
 #include <kernel/thread.h>
 #include <kernel/timer.h>

lib/debug/debug.c

@@ -32,6 +32,7 @@
 #include <arch/ops.h>
 #include <platform.h>
 #include <platform/debug.h>
+#include <platform/timer.h>
 #include <kernel/thread.h>
 #include <kernel/timer.h>
 #include <rand.h>

lib/fs/ext2/dir.c

@@ -198,7 +198,7 @@ int ext2_lookup(ext2_t *ext2, const char *_path, inodenum_t *inum)
 // © 2019 Mis012 - SPDX-License-Identifier: GPL-3.0
 // from here till the end of file
 
-status_t ext2_open_directory(fscookie *cookie, const char *path, dircookie **dircookie) {
+status_t ext2_open_directory(fscookie *cookie, const char *path, dircookie **dcookie) {
 	off_t entry_len = 0;
 	ext2_dir_t *dir = malloc(sizeof(ext2_dir_t));
 	memset(dir, 0, sizeof(ext2_dir_t));
@@ -225,7 +225,7 @@ status_t ext2_open_directory(fscookie *cookie, const char *path, dircookie **dir
 	dir->offset = 0;
 	dir->length = entry_len;
 
-	*dircookie = dir;
+	*dcookie = (dircookie *) dir;
 
 	return 0;
 }
@@ -254,7 +254,7 @@ status_t ext2_read_directory(dircookie *dircookie, struct dirent *ent) {
 status_t ext2_close_directory(dircookie *dircookie) {
 	ext2_dir_t *dir = (ext2_dir_t *)dircookie;
 
-	ext2_close_file(dir->file);
+	ext2_close_file((filecookie *)dir->file);
 	free(dir);
 	return 0;
 }

platform/msm8953/platform.c

@@ -35,6 +35,7 @@
 #include <qtimer.h>
 #include <mmu.h>
 #include <arch/arm/mmu.h>
+#include <arch/defines.h>
 #include <smem.h>
 #include <board.h>
 #include <boot_stats.h>