package/openocd: allow CMSIS-DAP support

package/openocd: allow CMSIS-DAP support

In commit aa441aa84c38ad5319c4ff7fb27c84530e19c204 ("openocd: bump to
version 0.8.0"), some logic in openocd.mk was added to enable
CMSIS-DAP when BR2_PACKAGE_OPENOCD_CMSIS_DAP is enabled, but this
option was not created, because hidapi was not packaged in
Buildroot. This package now exists, so we can create
BR2_PACKAGE_OPENOCD_CMSIS_DAP and really make it possible to build
CMSIS DAP support.

Signed-off-by: Matt Wood <mattwood2000@gmail.com>
[Thomas:
 - rework commit log
 - add missing "depends on" in Config.in]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>