isa-rtc.c doesn't use any definition from bcd.h, remove its inclusion
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20221212135953.212303-1-alexandre.belloni@bootlin.comSigned-off-by: Arnd Bergmann <arnd@arndb.de>