toolchain-external: fix typo in Blackfin toolchain config option

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/toolchain-external/Config.in

@@ -597,7 +597,7 @@ config BR2_TOOLCHAIN_EXTERNAL_BLACKFIN_UCLINUX_2012R2
 	  Toolchain for the Blackfin architecture, from
 	  http://blackfin.uclinux.org.
 
-config BR2_TOOLCHAIN_EXTERNAL_BLACKFI_UCLINUX_2012R1
+config BR2_TOOLCHAIN_EXTERNAL_BLACKFIN_UCLINUX_2012R1
 	bool "Blackfin.uclinux.org 2012R1-RC2"
 	depends on BR2_bfin
 	depends on BR2_HOSTARCH = "x86_64" || BR2_HOSTARCH = "x86"