Remove frameworks/opt/telephony from PDK

-Because framworks/opt/telephony requires components of
 the system in order to build, it cannot be part of the PDK.

-Removing the obsolete TARGET_BUILD_JAVA_SUPPORT_LEVEL flag.
 This flag was used for conditional Java platform support in PDK.

Note: this follows the pattern of frameworks/opt/net/wifi which
also depends on frameworks/base/services: ag/435261

Bug: 35992880
Test: compilation, aosp_sailfish and aosp_fugu
Change-Id: I3a4793cc7772617862588171c6207ffa35535cbb