u-boot: only apply 2011.12 at91 patch if building 2011.12

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

diff --git a/boot/uboot/uboot-v2011.12-change-kernel-address-in-dataflash.patch b/boot/uboot/uboot-2011.12/uboot-2011.12-change-kernel-address-in-dataflash.patch
similarity index 100%
rename from boot/uboot/uboot-v2011.12-change-kernel-address-in-dataflash.patch
rename to boot/uboot/uboot-2011.12/uboot-2011.12-change-kernel-address-in-dataflash.patch