[SRU utopic/trusty] LP#1418140 -- CONFIG_DEFAULT_MMAP_MIN_ADDR needs to match on armhf and arm64

[Andy Whitcroft]

Attempting to run armhf binaries on arm64 triggers those
binaries to be Killed.  This is actually because the default the
CONFIG_DEFAULT_MMAP_MIN_ADDR used on armhf (it must be 32768 or lower
due to an assembly limitation) is not valid on arm64.  While this can be
overriden via sysctl, the default should be sane.  Following this email are
two patches for Trusty and Utopic to unify this setting on armhf and arm64.

Proposing for SRU to Trusty and Utopic.

-apw