RX51 has a secure logic which uses different parameters compared to
traditional implementation. So, make the generic secure acr write
over-ride-able by board file and refactor rx51 code to use this.

While at it, enable the OMAP3 specific errata code for 454179, 430973,
621766.
Signed-off-by: NNishanth Menon <nm@ti.com>
Reviewed-by: NTom Rini <trini@konsulko.com>