automake_1.11.1.bb: Remove DEFAULT_PREFERENCE = "-1"

automake_1.11.1.bb: Remove DEFAULT_PREFERENCE = "-1"

Hi,

I was working on upgrading gettext and some other packages to latest
versions but they use features from automake 1.11. We have this recipe
but it not enabled. I ask for approval to make it default. I have
build few images thus far without any problems and SHR already uses
it as preferred automake. Some distributions ask for specific versions
they wont be affected.

Thanks

-Khem

* This would enable it by default for distributions
  who do not stick to a particular version of automake.

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Acked-by: Martin Jansa <Martin.Jansa@gmail.com>
Acked-by: Tom Rini <tom_rini@mentor.com>