[U-Boot] imx: Check the PL310 version for applying errata

[sbabic at denx.de]

> Apply errata based on PL310 version instead of compile
> time. Also set Prefetch offset to 15, since it improves
> memcpy performance by 35%. Don't enable Incr double
> Linefill enable since it adversely affects memcpy
> performance by about 32MB/s and reads by 90MB/s. Tested
> with 4K to 16MB sized src and dst aligned buffer.
> Signed-off-by: Nitin Garg <nitin.garg at freescale.com>
> Signed-off-by: Ye Li <ye.li at nxp.com>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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