next-cube: rename old_scr2 and scr2_2 in next_scr2_rtc_update()

Rename them to old_scr2_rtc and scr2_rtc to reflect that they contain the previous
and current values of the SCR2 RTC bits.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Message-ID: <20241222130012.1013374-33-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Thomas Huth <huth@tuxfamily.org>
1 file changed