package/kodi-inputstream-adaptive: add dependencies for supported archs

package/kodi-inputstream-adaptive: add dependencies for supported archs

kodi-inputstream-adaptive is available on a limited list of archs:
https://github.com/peak3d/inputstream.adaptive/blob/Krypton/wvdecrypter/cdm/build/build_config.h#L97

Fixes build error

/home/buildroot/br8/output/build/kodi-inputstream-adaptive-9af21218a87572bd4ab8d8d660c11f6295144f97/wvdecrypter/cdm/media/cdm/../../base/../base/../build/build_config.h:137:2: error: #error Please add support for your architecture in build/build_config.h
 #error Please add support for your architecture in build/build_config.h

for example with this defconfig:

BR2_powerpc64le=y
BR2_powerpc_power8=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
BR2_TOOLCHAIN_EXTERNAL_URL="http://autobuild.buildroot.net/toolchains/tarballs/br-powerpc64le-power8-glibc-2017.05-1078-g95b1dae.tar.bz2"
BR2_TOOLCHAIN_EXTERNAL_GCC_6=y
BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_12=y
BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y
BR2_TOOLCHAIN_EXTERNAL_CXX=y
BR2_PACKAGE_KODI=y
BR2_PACKAGE_KODI_INPUTSTREAM_ADAPTIVE=y
BR2_PACKAGE_MESA3D=y
BR2_PACKAGE_MESA3D_DRI_DRIVER_SWRAST=y
BR2_PACKAGE_MESA3D_OPENGL_EGL=y
BR2_PACKAGE_XORG7=y
BR2_PACKAGE_PYTHON=y
BR2_PACKAGE_PYTHON_PY_ONLY=y

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>