configs: synchronize CONFIG_HP_ILO between flavors & enable on x86/arm

JIRA: https://issues.redhat.com/browse/RHEL-65590
Upstream Status: RHEL only

since 'c88bb455d8cb configs: enable CONFIG_HP_ILO for aarch64'
CONFIG_HP_ILO was supposed to be enabled on aarch64 RHEL, but the fact
that it was disabled explicitly by default in configs/rhel/generic
meant that enabling it in common as was done in c88bb45 only affected
Fedora. A special case could be added for aarch64 RHEL as was done for
x86_64, but a cleaner option is just to remove the RHEL specific overrides
and just set the policy in common disabling it by default and enabling it
on aarch64 and x86_64 which will affect both RHEL and Fedora flavors.

Fixes: c88bb45 ("configs: enable CONFIG_HP_ILO for aarch64")

Signed-off-by: Charles Mirabile <cmirabil@redhat.com>

Author: Charles Mirabile