arm: qemu: Enable PRE_CONSOLE_BUFFER

Commit 608b80b5b8 ("riscv: qemu: Enable PRE_CONSOLE_BUFFER") enables
buffering console messages for QEMU RISC-V virtual machines so those
printed before the video console is available will still show up on the
display. Similarly, enable it for ARM virtual machines as well.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng@tinylab.org>

arch/arm/Kconfig

@@ -1041,6 +1041,7 @@ config ARCH_QEMU
 	imply VIDEO_BOCHS
 	imply SYS_WHITE_ON_BLACK
 	imply SYS_CONSOLE_IS_IN_ENV
+	imply PRE_CONSOLE_BUFFER
 
 config ARCH_RMOBILE
 	bool "Renesas ARM SoCs"

board/emulation/qemu-arm/Kconfig

@@ -12,6 +12,10 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	imply VIRTIO_NET
 	imply VIRTIO_BLK
 
+config PRE_CON_BUF_ADDR
+	hex
+	default 0x40100000
+
 endif
 
 if TARGET_QEMU_ARM_64BIT && !TFABOOT