[watchos] Stop building watchos-armv7k and watchsimulator-i386
When the deployment target is above 9.0 (7.0 for simulator), only
building the module content such as the swiftinterface is supported.
(cherry picked from commit ae3e4a1a10bc9b24e41822d95c8944dd66cc868c)
(cherry picked from commit 3c2e58ed8f5e536c4c1e3c096d1f4540a07aea4a)
