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/bf561-acvilon_defconfig b/configs/bf561-acvilon_defconfig
index 744eb1c..809a06c 100644
--- a/configs/bf561-acvilon_defconfig
+++ b/configs/bf561-acvilon_defconfig
@@ -16,5 +16,6 @@
 CONFIG_CMD_CACHE=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_ATMEL=y
+CONFIG_BAUDRATE=57600
 CONFIG_CC_OPTIMIZE_LIBS_FOR_SPEED=y
 CONFIG_LIB_RAND=y