raspi4b: Reduce RAM to 1Gb on 32-bit hosts

Change the board revision number and RAM size to 1Gb on 32-bit hosts.
On these systems, RAM has a 2047 MB limit and this breaks the tests.

Fixes: 7785e8e ("hw/arm: Introduce Raspberry PI 4 machine")
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Message-id: 20240329150155.357043-1-clg@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/raspi4b.c

@@ -112,7 +112,11 @@ static void raspi4b_machine_class_init(ObjectClass *oc, void *data)
     MachineClass *mc = MACHINE_CLASS(oc);
     RaspiBaseMachineClass *rmc = RASPI_BASE_MACHINE_CLASS(oc);
 
+#if HOST_LONG_BITS == 32
+    rmc->board_rev = 0xa03111; /* Revision 1.1, 1 Gb RAM */
+#else
     rmc->board_rev = 0xb03115; /* Revision 1.5, 2 Gb RAM */
+#endif
     raspi_machine_class_common_init(mc, rmc->board_rev);
     mc->init = raspi4b_machine_init;
 }