net: stmmac: clear priv->tx_path_in_lpi_mode when disabling LPI

As other code paths do, clear priv->tx_path_in_lpi_mode when disabling
LPI. This is done after the software timer has been deleted and
hardware LPI has been disabled.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1tffdd-003ZIB-22@rmk-PC.armlinux.org.uk


Signed-off-by: Jakub Kicinski <kuba@kernel.org>