firmware: turris-mox-rwtm: Fix driver includes

Drop including of.h, include several other headers that are used but not
included directly.
Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://lore.kernel.org/r/20240831092050.23093-6-kabel@kernel.orgSigned-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/firmware/turris-mox-rwtm.c

@@ -8,18 +8,23 @@
 #include <crypto/sha2.h>
 #include <linux/armada-37xx-rwtm-mailbox.h>
 #include <linux/completion.h>
+#include <linux/container_of.h>
 #include <linux/debugfs.h>
+#include <linux/device.h>
 #include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/fs.h>
 #include <linux/hw_random.h>
 #include <linux/if_ether.h>
+#include <linux/kobject.h>
 #include <linux/mailbox_client.h>
 #include <linux/minmax.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
-#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/sizes.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/types.h>
 
 #define DRIVER_NAME		"turris-mox-rwtm"