serial: pmac_zilog: remove unused uart_pmac_port::termios_cache

struct uart_pmac_port contains termios_cache. It is only written and
never read. Remove it as it only occupies space.

Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220519075653.31356-2-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/pmac_zilog.c

@@ -1231,8 +1231,6 @@ static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	pmz_debug("pmz: set_termios()\n");
 
-	memcpy(&uap->termios_cache, termios, sizeof(struct ktermios));
-
 	/* XXX Check which revs of machines actually allow 1 and 4Mb speeds
 	 * on the IR dongle. Note that the IRTTY driver currently doesn't know
 	 * about the FIR mode and high speed modes. So these are unused. For

drivers/tty/serial/pmac_zilog.h

@@ -55,8 +55,6 @@ struct uart_pmac_port {
 	volatile u8			__iomem *data_reg;
 
 	unsigned char			irq_name[8];
-
-	struct ktermios			termios_cache;
 };
 
 #define to_pmz(p) ((struct uart_pmac_port *)(p))