qemu-h8300: add serial port and speed

target/config/Config.in.runtime

@@ -395,6 +395,7 @@ config ADK_RUNTIME_CONSOLE_SERIAL_DEVICE
 	default "ttySC1" if ADK_TARGET_SYSTEM_HP_JORNADA
 	default "ttySC0" if ADK_TARGET_SYSTEM_SIM_H8300H
 	default "ttySC2" if ADK_TARGET_SYSTEM_HITACHI_EDOSK2674
+	default "ttySC2" if ADK_TARGET_SYSTEM_QEMU_H8300
 	default "ttySIF0" if ADK_TARGET_SYSTEM_SIPEED_MAIX_BIT
 	default "ttySIF0" if ADK_TARGET_SYSTEM_SIPEED_MAIXDUINO
 	default "ttymxc0" if ADK_TARGET_SYSTEM_SOLIDRUN_IMX6
@@ -430,6 +431,7 @@ config ADK_RUNTIME_CONSOLE_SERIAL_SPEED
 	default "38400" if ADK_TARGET_SYSTEM_HITACHI_EDOSK2674
 	default "38400" if ADK_TARGET_SYSTEM_NUMATO_MIMASV2
 	default "38400" if ADK_TARGET_SYSTEM_DIGILENT_ATLYS
+	default "38400" if ADK_TARGET_SYSTEM_QEMU_H8300
 	default "115200"
 
 config ADK_RUNTIME_KBD_LAYOUT