feat(hikey960): read serial number from UFS

Serial number is written into UFS by fastboot
Pass BL2 params to BL31 (serial number)

Change-Id: I9a490db07ca10088da69191a2f2c1621d44a278c
Signed-off-by: vallau01 <valentin.laurent@trustonic.com>
Signed-off-by: Lukas Hanel <lukas.hanel@trustonic.com>
4 files changed