configs: add sercon port and disable pxe serial console for apu{2,3,4,5}

To avoid mangled characters on serial output from iPXE we have to disable
serial from iPXE console. More to that to have correct serial input we
have to enable SeaBIOS SERCON option with default configuration.

The only limitation of this configs is that apu5 doesn't detect iPXE -
that platform is not for public use so it doesn't affect anyone.

Change-Id: I124705bd691b3c8dcd9a2636b17c019d02732c5a
Signed-off-by: Piotr Król <piotr.krol@3mdeb.com>
Reviewed-on: https://review.coreboot.org/28616
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/configs/config.pcengines_apu1 b/configs/config.pcengines_apu1
new file mode 100644
index 0000000..e511d65
--- /dev/null
+++ b/configs/config.pcengines_apu1
@@ -0,0 +1,10 @@
+# CONFIG_COLLECT_TIMESTAMPS is not set
+CONFIG_VENDOR_PCENGINES=y
+CONFIG_BOARD_PCENGINES_APU1=y
+CONFIG_NO_GFX_INIT=y
+CONFIG_SEABIOS_ADD_SERCON_PORT_FILE=y
+CONFIG_PXE=y
+CONFIG_BUILD_IPXE=y
+CONFIG_PXE_ROM_ID="10ec,8168"
+# CONFIG_PXE_SERIAL_CONSOLE is not set
+CONFIG_MEMTEST_SECONDARY_PAYLOAD=y