rockchip: veyron: Add serial, logging, silent console support

Commit eba768c54587 ("rockchip: jerry: Add serial support") enables
ROCKCHIP_SERIAL for chromebook_jerry to make the serial console work
correctly. Enable it also for other veyron boards.

Also enable logging and disable scrolling multiple lines at once as in
chromebook_jerry, and enable silent console as chromebook_minnie does.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/chromebook_speedy_defconfig b/configs/chromebook_speedy_defconfig
index 0295610..6c7eb42 100644
--- a/configs/chromebook_speedy_defconfig
+++ b/configs/chromebook_speedy_defconfig
@@ -27,6 +27,7 @@
 CONFIG_USE_PREBOOT=y
 CONFIG_DEFAULT_FDT_FILE="rk3288-veyron-speedy.dtb"
 CONFIG_SILENT_CONSOLE=y
+CONFIG_LOG=y
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_BOARD_EARLY_INIT_R=y