tty: serial: st-asc: Make the locking RT aware
The lock is a sleeping lock and local_irq_save() is not the standard implementation now. Working for both -RT and non RT. Signed-off-by: NLionel Debieve <lionel.debieve@st.com> Acked-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: NPatrice Chotard <patrice.chotard@st.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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