package/openocd: depends on libftdi1 instead of libftdi

Note that, if both libftdi and libftdi1 are available, openocd will
prefer libftdi1, so does Buildroot. ;-)

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>