manifest: add Xperia SP

 repositories to be forked from

  https://github.com/championswimmer/device_sony_huashan
  https://github.com/championswimmer/kernel_sony_msm8960t

Change-Id: I6734d4e347e9c497356faf3ff7247dcdd82e8942
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>