meta-ampere: mtjade: fix Mt.Jade recipes not enabled

Using IMAGE_INSTALL in mtjade.conf makes other Ampere recipes not
included in the build. This commit fixes the issue by enabling the
mtd-utils in OBMC_IMAGE_EXTRA_INSTALL_append instead.

Tested:
1. Check if all Ampere services and scripts available.
2. Check power control operations

Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
Change-Id: I17293ba520c05a7b5a438767c790f00220156d3f
diff --git a/meta-ampere/meta-jade/conf/machine/mtjade.conf b/meta-ampere/meta-jade/conf/machine/mtjade.conf
index 8c43cbd..43a1059 100644
--- a/meta-ampere/meta-jade/conf/machine/mtjade.conf
+++ b/meta-ampere/meta-jade/conf/machine/mtjade.conf
@@ -15,10 +15,6 @@
 
 OBMC_POWER_SUPPLY_INSTANCES = "0 1"
 
-IMAGE_INSTALL += " \
-                  mtd-utils \
-                 "
-
 OBMC_MACHINE_FEATURES += "\
         obmc-phosphor-chassis-mgmt \
         obmc-phosphor-flash-mgmt \
@@ -34,6 +30,7 @@
                                    ampere-flash-utils \
                                    ampere-mac-update \
                                    mtjade-gpio-config \
+                                   mtd-utils \
                                   "
 
 PREFERRED_PROVIDER_virtual/obmc-chassis-mgmt = "packagegroup-ampere-apps"