AMD boards: routing.asl: Uniformly start `Package()` with capital letter

AMD boards: routing.asl: Uniformly start `Package()` with capital letter

In commit  Rudolf Marek discovered, that it is not uniformly written. As
»ASL names are not case-sensitive and will be converted to upper case.« [2]
this change does not have any functional change.

The following command was used to create this patch.

    $ git grep -l 'package()' src/mainboard | xargs sed -i 's,package(),Package(),'

[1] http://review.coreboot.org/#/c/3318/
[2] http://www.acpi.info/spec40a.htm
    (18.2.1 ASL Names)

Change-Id: I1784dbc50936a1ef9d4376209a3c324ef1fb85cf
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/3516
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>