1.use get_rkss_version function to get rkss version,
if security partition have data with rkss version 1, then
we choice rkss version 1, if security partition is empty,
then we choice rkss version 2
2.rkss version 2 support dual backup mechanism,
security partition total use 1M
3.rkss version 2 R&W 256k data one time
Change-Id: I2f17b22d6a442df84be0d94a808b03465dc6fefe
Signed-off-by: Hisping Lin <hisping.lin@rock-chips.com>
Hisping Lin