configs: Migrate and re-enabled CONFIG_CMD_MTDPARTS

Now that CMD_UBI does not select CMD_MTDPARTS we need to make platforms
that had been enabling it turn it on by hand.  This exposed that we had
not yet migrated CMD_MTDPARTS fully, so do so now.

Fixes: 86dfa556d927 ("cmd: ubi: Remove useless call to mtdparts_init()")
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/pxm2_defconfig b/configs/pxm2_defconfig
index 70863a2..4a5c3c6 100644
--- a/configs/pxm2_defconfig
+++ b/configs/pxm2_defconfig
@@ -50,6 +50,7 @@
 CONFIG_CMD_TIME=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
+CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nand0=omap2-nand.0"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=omap2-nand.0:128k(spl),128k(spl.backup1),128k(spl.backup2),128k(spl.backup3),1920k(u-boot),128k(uboot.env),5120k(kernel_a),5120k(kernel_b),8192k(mtdoops),-(rootfs)"
 CONFIG_CMD_UBI=y