git-svn (and git) doesn't handle empty directories, so add .empty files
to those dirs like elsewhere in buildroot.
Those empty directories are normally not a big deal, but the recent changes
to u-boot broke the build.
------------------------------------------
Replace $(BOARDNAME)_PATH with BOARD_PATH
Set U-Boot targets for 1.2.0-atmel as well as 2009.01-rc1
Remove hardwiring of BusyBox configuration files.
Remove older BusyBox configuration files
Remove "at91sam9260dfc-linux-2.6.28-rc6.config" from at91sam9g20dfc directory
Update "at91rm9200df_defconfig"
Add "at91rm9200df-linux-2.6.28.config"
Update "at91sam9260dfc_defconfig"
