meta-phosphor: remove OBMC_MACHINE_FEATURES indirect

Clean up the final part of this indirect, which is the append of the
variable to the MACHINE_FEATURES one.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I2077d7acff5602b7bf333677f5866d979bdaa07c
diff --git a/meta-phosphor/conf/distro/include/phosphor-base.inc b/meta-phosphor/conf/distro/include/phosphor-base.inc
index 731f9f1..64f293c 100644
--- a/meta-phosphor/conf/distro/include/phosphor-base.inc
+++ b/meta-phosphor/conf/distro/include/phosphor-base.inc
@@ -110,10 +110,6 @@
         ${DISTRO_FEATURES_OBMC} \
         "
 
-MACHINE_FEATURES += " \
-        ${OBMC_MACHINE_FEATURES} \
-        "
-
 DISTRO_EXTRA_RDEPENDS:remove:qemuarm = "packagegroup-core-device-devel"
 
 include conf/distro/include/openbmc-phosphor/${MACHINE}.inc