qemu-system-arm: fix vexpress defconfig

target/arm/kernel/qemu-arm-vexpress-a9

@@ -8,6 +8,7 @@ CONFIG_ARCH_VEXPRESS_DCSCB=y
 CONFIG_ARCH_VEXPRESS_SPC=y
 CONFIG_ARCH_VEXPRESS_TC2_PM=y
 CONFIG_PLAT_VERSATILE=y
+CONFIG_ARM_PATCH_PHYS_VIRT=y
 CONFIG_ARM_THUMB=y
 CONFIG_ARM_VIRT_EXT=y
 CONFIG_SWP_EMULATE=y
@@ -22,3 +23,5 @@ CONFIG_REGULATOR_FIXED_VOLTAGE=y
 CONFIG_REGULATOR_VEXPRESS=y
 CONFIG_CLK_SP810=y
 CONFIG_CLK_VEXPRESS_OSC=y
+
+