Kconfig: Migrate CONFIG_BAUDRATE

Move this in to Kconfig with a default of 115200.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[trini: Run moveconfig.py, reword commit slightly]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/PLU405_defconfig b/configs/PLU405_defconfig
index 90afe64..652edcd 100644
--- a/configs/PLU405_defconfig
+++ b/configs/PLU405_defconfig
@@ -20,6 +20,7 @@
 CONFIG_MAC_PARTITION=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_BAUDRATE=9600
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y