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/caddy2_defconfig b/configs/caddy2_defconfig
index e33c96b..85c21e5 100644
--- a/configs/caddy2_defconfig
+++ b/configs/caddy2_defconfig
@@ -14,5 +14,6 @@
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y
+CONFIG_BAUDRATE=9600
 CONFIG_SYS_NS16550=y
 CONFIG_OF_LIBFDT=y