arm: qemu: Enable the debug UART

Enable this to permit early debugging. Due to the way qmeu works, the
input clock can be zero and things still work.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/qemu_arm_defconfig b/configs/qemu_arm_defconfig
index ab55748..d4f6d0b 100644
--- a/configs/qemu_arm_defconfig
+++ b/configs/qemu_arm_defconfig
@@ -6,7 +6,10 @@
 CONFIG_ENV_SIZE=0x40000
 CONFIG_ENV_SECT_SIZE=0x40000
 CONFIG_TARGET_QEMU_ARM_32BIT=y
+CONFIG_DEBUG_UART_BASE=0x9000000
+CONFIG_DEBUG_UART_CLOCK=0
 CONFIG_ARMV7_LPAE=y
+CONFIG_DEBUG_UART=y
 CONFIG_AHCI=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_SYS_LOAD_ADDR=0x40200000
@@ -49,6 +52,8 @@
 CONFIG_PCIE_ECAM_GENERIC=y
 CONFIG_SCSI=y
 CONFIG_DM_SCSI=y
+CONFIG_DEBUG_UART_PL011=y
+CONFIG_DEBUG_UART_SHIFT=2
 CONFIG_SYSRESET=y
 CONFIG_SYSRESET_PSCI=y
 CONFIG_TPM2_MMIO=y