coco/tsm: Remove unused variable tsm_rwsem

This variable is and was never used, remove it.

Fixes: 603c646 ("coco/tsm: Introduce a core device for TEE Security Managers")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://patch.msgid.link/20260120-coco-tsm_rwsem-v1-1-125059fe2f69@linutronix.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Author: t-8ch

drivers/virt/coco/tsm-core.c

@@ -4,14 +4,12 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/tsm.h>
-#include <linux/rwsem.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/cleanup.h>
 #include <linux/pci-tsm.h>
 
 static struct class *tsm_class;
-static DECLARE_RWSEM(tsm_rwsem);
 static DEFINE_IDA(tsm_ida);
 
 static int match_id(struct device *dev, const void *data)