u-boot_2012.04.01-psp03.22.00.02.sdk: Set sourceipk variables.

Signed-off-by: Daniel Diaz <ddiaz@ti.com>
arago: Prefer u-boot 2012.04.01 PSP 03.22.00.02 for DA830.

Signed-off-by: Daniel Diaz <ddiaz@ti.com>