Option to enable XLB pipelining in MPC5200

Hello,

this patch adds the option CFG_XLB_PIPELINING to cpu/mpc5xxx/cpu_init.c to enable XLB pipelining. This improves FTP performance and is enabled in IceCube by default. Other MPC5200 boards should benefit from this as well.

Regards
Mark

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Added, thanks.

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
God may be subtle, but He isn't plain mean.         - Albert Einstein