[toolchains] just need one armv7 toolchain
[package] [libafpclient-osmc] add armv7 support
[package] [libnfs-osmc] add armv7 support
[package] [librtmp-osmc] add armv7 support
[package] [libshairplay-osmc] add armv7 support
[package] [splash-osmc] add armv7 support
[package] [tvheadend-app-osmc] add armv7 support