graphics/nvidia: Add missing kernel protection flags.

This may be the real cause of #17766.

src/add-ons/kernel/drivers/graphics/nvidia/driver.c

@@ -893,7 +893,7 @@ open_hook(const char* name, uint32 flags, void** cookie)
 	/* create this area with NO user-space read or write permissions, to prevent accidental damage */
 	di->shared_area = create_area(shared_name, (void **)&(di->si), B_ANY_KERNEL_ADDRESS,
 		((sizeof(shared_info) + (B_PAGE_SIZE - 1)) & ~(B_PAGE_SIZE - 1)), B_FULL_LOCK,
-		B_CLONEABLE_AREA);
+		B_KERNEL_READ_AREA | B_KERNEL_WRITE_AREA | B_CLONEABLE_AREA);
 	if (di->shared_area < 0) {
 		/* return the error */
 		result = di->shared_area;