at91sam9260dfc_defconfig: fix kernel defconfig name

at91sam9260_defconfig contains support for the EVM (since v3.2).

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

configs/at91sam9260dfc_defconfig

@@ -15,7 +15,7 @@ BR2_TARGET_UBOOT_2011_12=y
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_USE_DEFCONFIG=y
-BR2_LINUX_KERNEL_DEFCONFIG="at91sam9260ek"
+BR2_LINUX_KERNEL_DEFCONFIG="at91sam9260"
 
 # Filesystem
 BR2_TARGET_ROOTFS_TAR=y