Convert CONFIG_MTD_PARTITIONS et al to Kconfig

This converts the following to Kconfig:
   CONFIG_MTD_PARTITIONS
   CONFIG_MTD_DEVICE

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/TWR-P1025_defconfig b/configs/TWR-P1025_defconfig
index 30ab4f6..5d850b9 100644
--- a/configs/TWR-P1025_defconfig
+++ b/configs/TWR-P1025_defconfig
@@ -32,6 +32,8 @@
 CONFIG_SATA_SIL3114=y
 CONFIG_FSL_ESDHC=y
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_MTD_DEVICE=y
+CONFIG_MTD_PARTITIONS=y
 CONFIG_PHY_MARVELL=y
 CONFIG_NETDEVICES=y
 CONFIG_PHY_GIGE=y