yocto-bsp: Typo on the file extension

By mistake, the file initially had a wrong extension name, so changing to the
correct one.

(From meta-yocto rev: 32c2278b8fe93429d4cfa097eefccd20157cd3b8)

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/scripts/lib/bsp/substrate/target/arch/arm/recipes-kernel/linux/linux-yocto_4.1.bbapend b/scripts/lib/bsp/substrate/target/arch/arm/recipes-kernel/linux/linux-yocto_4.1.bbappend
similarity index 100%
rename from scripts/lib/bsp/substrate/target/arch/arm/recipes-kernel/linux/linux-yocto_4.1.bbapend
rename to scripts/lib/bsp/substrate/target/arch/arm/recipes-kernel/linux/linux-yocto_4.1.bbappend