Use correct SDKROOT for tvos_application (no _).
Use correct SDKROOT for tvos_application (no _).

Tulsi was only using "appletvos" as the SDKROOT for _tvos_application.
Once the name changed to remove the underscore, it was incorrectly
using "iphoneos" for those targets instead.

--
PiperOrigin-RevId: 148121067
MOS_MIGRATED_REVID=148121067

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