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/vexpress_ca5x2_defconfig b/configs/vexpress_ca5x2_defconfig
index d17cb36..fb67141 100644
--- a/configs/vexpress_ca5x2_defconfig
+++ b/configs/vexpress_ca5x2_defconfig
@@ -18,4 +18,5 @@
 # CONFIG_CMD_NFS is not set
 # CONFIG_CMD_MISC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_BAUDRATE=38400
 CONFIG_OF_LIBFDT=y