[U-Boot] cache support make DaVinci dm365 quicker reading emmc

Thanks to:

commit c3330e9d6a11b6ead4a2346001338ce884b5832b Author: Heiko Schocher hs@denx.de Date: Fri Sep 17 13:10:30 2010 +0200

ARM (ARM926ejs): add data cache support, tested on magnesium and tx25 board

My 'Basi' board, based on DaVinci dm365, can read the uImage (1.5MB) in 0.7 sec (with ext2load) instead of 2 sec. If I read using mmc read I can reach 0.3 sec, but I need to know the dimension.

Take in account only that tftpboot doesn't work with dcache/icache enabled.

Regards, Raffaele