drivers: kscan: fix syscall handlers

No check of the driver object was being performed for two
APIs.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
diff --git a/drivers/kscan/kscan_handlers.c b/drivers/kscan/kscan_handlers.c
index 6198688..6126191 100644
--- a/drivers/kscan/kscan_handlers.c
+++ b/drivers/kscan/kscan_handlers.c
@@ -19,12 +19,16 @@
 
 static inline int z_vrfy_kscan_disable_callback(struct device *dev);
 {
+	Z_OOPS(Z_SYSCALL_DRIVER_KSCAN(dev, disable_callback));
+
 	return z_impl_kscan_disable_callback((struct device *)dev);
 }
 #include <syscalls/kscan_disable_callback_mrsh.c>
 
 static int z_vrfy_kscan_enable_callback(struct device *dev);
 {
+	Z_OOPS(Z_SYSCALL_DRIVER_KSCAN(dev, enable_callback));
+
 	return z_impl_kscan_enable_callback((struct device *)dev);
 }
 #include <syscalls/kscan_enable_callback_mrsh.c>