Convert CONFIG_CMD_BSP to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_BSP

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/CPCI2DP_defconfig b/configs/CPCI2DP_defconfig
index 1787a8a..96a7643 100644
--- a/configs/CPCI2DP_defconfig
+++ b/configs/CPCI2DP_defconfig
@@ -10,6 +10,7 @@
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_NET is not set
 # CONFIG_CMD_NFS is not set
+CONFIG_CMD_BSP=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_BAUDRATE=9600