Revert "meta-phosphor: disable 'uninative' for RHEL6 support"

Drop support for RHEL6 which has been unsupported by Poky
since 2.1.

This reverts commit c83cf1ce570d4771b1e42ded308bf4110e70408b.

Tested: Built a witherspoon image
Change-Id: Idd8dda940c72a69a7a228733c34018f906ec9b8f
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/classes/obmc-phosphor-image.bbclass b/meta-phosphor/classes/obmc-phosphor-image.bbclass
index 5570841..1a51614 100644
--- a/meta-phosphor/classes/obmc-phosphor-image.bbclass
+++ b/meta-phosphor/classes/obmc-phosphor-image.bbclass
@@ -25,10 +25,6 @@
 inherit obmc-phosphor-license
 inherit obmc-phosphor-utils
 
-# TODO: openbmc/openbmc#1407 - Remove with RHEL6 support deprecation.
-#     Set supported kernel back to RHEL6.4's kernel.
-SDK_OLDEST_KERNEL = "2.6.32"
-
 FEATURE_PACKAGES_obmc-bmc-state-mgmt ?= "packagegroup-obmc-apps-bmc-state-mgmt"
 FEATURE_PACKAGES_obmc-chassis-mgmt ?= "${@cf_enabled(d, 'obmc-phosphor-chassis-mgmt', 'virtual-obmc-chassis-mgmt')}"
 FEATURE_PACKAGES_obmc-chassis-state-mgmt ?= "packagegroup-obmc-apps-chassis-state-mgmt"
diff --git a/meta-phosphor/conf/distro/include/phosphor-base.inc b/meta-phosphor/conf/distro/include/phosphor-base.inc
index d318da7..236a47e 100644
--- a/meta-phosphor/conf/distro/include/phosphor-base.inc
+++ b/meta-phosphor/conf/distro/include/phosphor-base.inc
@@ -59,12 +59,7 @@
 
 include conf/distro/include/openbmc-phosphor/${MACHINE}.inc
 
-# TODO: openbmc/openbmc#1407 - Remove with RHEL6 support deprecation.
-#  RHEL6.4's kernel is too old to use the uninative-shim due to missing
-#  syscall support.  Disable uninative and set OLDEST_KERNEL back to
-#  the version in RHEL6.4.
 INHERIT_remove = " uninative"
-OLDEST_KERNEL = "2.6.32"
 
 KERNEL_FEATURES_append = " phosphor-gpio-keys"
 KERNEL_FEATURES_remove_qemuall = " phosphor-gpio-keys"