defconfig: 8960: Enable support for SMC USB ethernet adapter

Enable the config (USB_PEGASUS) for SMC based USB ethernet adapters

Change-Id: I866d6d57d146ae12ce326a5c198d8dd8bc10ec2e
Signed-off-by: Ravi Vembu <a18394@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/616905
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Reviewed-by: Ravikumar Vembu <raviv@motorola.com>
SLTApproved: Christopher Fries <c.fries@motorola.com>
(cherry picked from commit f5c67c01e09a33f32f8762b803d0cd25a806f164)