emulation/qemu-q35: Increase default ROM_SIZE

Larger size fits GRUB payload and fixes case to
build 82801ix with HAVE_INTEL_FIRMWARE.

Change-Id: I90e33fb3a0b0e1a60dcc2a9a022bef034f3270d8
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17830
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/emulation/qemu-q35/Kconfig b/src/mainboard/emulation/qemu-q35/Kconfig
index 3000533..e5c06d5 100644
--- a/src/mainboard/emulation/qemu-q35/Kconfig
+++ b/src/mainboard/emulation/qemu-q35/Kconfig
@@ -8,7 +8,7 @@
 #	select HAVE_OPTION_TABLE
 #	select HAVE_PIRQ_TABLE
 	select HAVE_ACPI_TABLES
-	select BOARD_ROMSIZE_KB_256
+	select BOARD_ROMSIZE_KB_2048
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
 	select MAINBOARD_DO_NATIVE_VGA_INIT
 	select MAINBOARD_HAS_NATIVE_VGA_INIT_TEXTMODECFG