driver core: fix up some missing class.devnode() conversions.

In commit ff62b8e658 ("driver core: make struct class.devnode() take a
const *") the ->devnode callback changed the pointer to be const, but a
few instances of PowerPC drivers were not caught for some reason.

Fix this up by changing the pointers to be const.

Fixes: ff62b8e658 ("driver core: make struct class.devnode() take a const *")
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Frederic Barrat <fbarrat@linux.ibm.com>
Cc: Andrew Donnellan <ajd@linux.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linuxppc-dev@lists.ozlabs.org
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/r/20221128173539.3112234-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/powerpc/platforms/book3s/vas-api.c

@@ -53,7 +53,7 @@ struct coproc_instance {
 	struct vas_window *txwin;
 };
 
-static char *coproc_devnode(struct device *dev, umode_t *mode)
+static char *coproc_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "crypto/%s", dev_name(dev));
 }

drivers/misc/cxl/file.c

@@ -546,7 +546,7 @@ static const struct file_operations afu_master_fops = {
 };
 
 
-static char *cxl_devnode(struct device *dev, umode_t *mode)
+static char *cxl_devnode(const struct device *dev, umode_t *mode)
 {
 	if (cpu_has_feature(CPU_FTR_HVMODE) &&
 	    CXL_DEVT_IS_CARD(dev->devt)) {

drivers/misc/ocxl/file.c

@@ -581,7 +581,7 @@ void ocxl_file_unregister_afu(struct ocxl_afu *afu)
 	device_unregister(&info->dev);
 }
 
-static char *ocxl_devnode(struct device *dev, umode_t *mode)
+static char *ocxl_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "ocxl/%s", dev_name(dev));
 }