configs: enable poweroff command on QEMU ARM platforms

Enable the sysreset based poweroff command. It invokes PSCI.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

configs/qemu_arm64_defconfig

@@ -63,6 +63,7 @@ CONFIG_DM_SCSI=y
 CONFIG_DEBUG_UART_PL011=y
 CONFIG_DEBUG_UART_SHIFT=2
 CONFIG_SYSRESET=y
+CONFIG_SYSRESET_CMD_POWEROFF=y
 CONFIG_SYSRESET_PSCI=y
 CONFIG_TPM2_MMIO=y
 CONFIG_USB=y

configs/qemu_arm_defconfig

@@ -65,6 +65,7 @@ CONFIG_DM_SCSI=y
 CONFIG_DEBUG_UART_PL011=y
 CONFIG_DEBUG_UART_SHIFT=2
 CONFIG_SYSRESET=y
+CONFIG_SYSRESET_CMD_POWEROFF=y
 CONFIG_SYSRESET_PSCI=y
 CONFIG_TPM2_MMIO=y
 CONFIG_USB=y