cmd: Kconfig: Move CONFIG_MP to Kconfig

This patch moves CONFIG_MP to Kconfig

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/sbc8641d_defconfig b/configs/sbc8641d_defconfig
index 9779596..9b1ce6e 100644
--- a/configs/sbc8641d_defconfig
+++ b/configs/sbc8641d_defconfig
@@ -13,6 +13,7 @@
 CONFIG_CMD_PCI=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_PING=y
+CONFIG_MP=y
 CONFIG_DOS_PARTITION=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y