MAINTAINERS: add an entry for the i8257 (DMA controller)

Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

MAINTAINERS

@@ -877,6 +877,7 @@ F: hw/timer/hpet*
 F: hw/timer/i8254*
 F: hw/timer/mc146818rtc*
 F: include/hw/i2c/pm_smbus.h
+F: include/hw/isa/i8257.h
 F: include/hw/timer/hpet.h
 F: include/hw/timer/i8254*
 F: include/hw/timer/mc146818rtc*