85xx: Add support for not releasing secondary cores via 'mp_holdoff'

85xx: Add support for not releasing secondary cores via 'mp_holdoff'

Some OSes require that secondary cores not be initialized when they
are booted (eg VxWorks).  By default when U-Boot is compiled with the
CONFIG_MP option all secondary cores are brought out of reset and held
in spinloops.  Setting the "mp_holdoff" environment variable to 'yes'
or '1' will cause U-Boot to leave secondary cores in their default
state.

Signed-off-by: Aaron Sierra <[email protected]>
Signed-off-by: Peter Tyser <[email protected]>
Signed-off-by: Kumar Gala <[email protected]>