hw/i386/pc: Include missing 'sysemu/tcg.h' header

Since commit 6f529b7 ("target/i386: move FERR handling
to target/i386") pc_q35_init() calls tcg_enabled() which
is declared in "sysemu/tcg.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904124325.79040-2-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/i386/pc_q35.c

@@ -34,6 +34,7 @@
 #include "hw/loader.h"
 #include "hw/i2c/smbus_eeprom.h"
 #include "hw/rtc/mc146818rtc.h"
+#include "sysemu/tcg.h"
 #include "sysemu/kvm.h"
 #include "hw/kvm/clock.h"
 #include "hw/pci-host/q35.h"