Add INIT_ALL build option

This option replaces WITH_INIT_ALL_PATTERN and WITH_INIT_ALL_ZERO with
INIT_ALL=pattern and INIT_ALL=zero respectively. As these are
relatively rarely used options no back

Add INIT_ALL build option

This option replaces WITH_INIT_ALL_PATTERN and WITH_INIT_ALL_ZERO with
INIT_ALL=pattern and INIT_ALL=zero respectively. As these are
relatively rarely used options no backwards compatibility is
implemented.

Reviewed by: emaste
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D41675

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