mb/emulation/qemu-q35: Increase max size of ACPI tables

When the TPM is enabled in QEMU the fw_cfg interface will return
~200KiB of ACPI tables, so this needs to be increased from the default
in order to be able to boot.

This is seen when using a TPM with qemu as it will hang when
processing the fw_cfg tables.

qemu-system-x86_64 \
  -machine q35 -enable-kvm -vga virtio -serial stdio \
  -drive 'id=hd,file=disk.bin' -bios coreboot.rom \
  -chardev 'socket,id=swtpm,path=/tmp/swtpm/swtpm-sock' \
  -tpmdev 'emulator,id=tpm0,chardev=swtpm' \
  -device 'tpm-tis,tpmdev=tpm0'

Change-Id: I21980aace8e86e636f5ae7b55148f4c31404edba
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39833
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/emulation/qemu-q35/Kconfig

@@ -51,6 +51,11 @@ config MMCONF_BASE_ADDRESS
 	hex
 	default 0xb0000000
 
+# fw_cfg tables can be larger than the default when TPM is enabled
+config MAX_ACPI_TABLE_SIZE_KB
+	int
+	default 224
+
 # Skip the first 64KiB as coreboot table pointer is installed
 # at address 0
 config DCACHE_RAM_BASE