bes2600: export bus_reset helpers for danctnix bes2600_btuart (danctnix-flavor)

bes2600_chrdev_do_bus_reset() and bes2600_chrdev_trigger_bus_reset() are
already present (added by the connection-loss bus_reset commit) but not
exported.  danctnix's bes2600_btuart.c uses these symbols for BT power
switching and bus-error recovery; without EXPORT_SYMBOL_GPL the btuart
module cannot be built as a separate object in the intree staging tree.

The userspace /dev/bes2600 chardev remains intact for danctnix — btuart
depends on the internal chardev state machine.  This commit is
danctnix-specific; the Mobian DKMS flavor does not need the exports.

Signed-off-by: Claude (noether) <claude@reauktion.de>

bes2600/bes_chardev.c

@@ -1116,6 +1116,7 @@ int bes2600_chrdev_do_bus_reset(const struct sbus_ops *sbus_ops, struct sbus_pri
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(bes2600_chrdev_do_bus_reset);
 
 /*
  * Trigger bes2600_chrdev_do_bus_reset() against the file-global
@@ -1128,6 +1129,7 @@ int bes2600_chrdev_trigger_bus_reset(void)
 	return bes2600_chrdev_do_bus_reset(bes2600_cdev.sbus_ops,
 					   bes2600_cdev.sbus_priv);
 }
+EXPORT_SYMBOL_GPL(bes2600_chrdev_trigger_bus_reset);
 
 bool bes2600_chrdev_is_wifi_opened(void)
 {