Add framework-sdkextensions to jars to instrument

Required to get code coverage.

Bug: 143937446
Test: verify LOCAL_SOONG_JACOCO_REPORT_CLASSES_JAR is set
      for framework-sdkextensions
Change-Id: I2cdb8ce60939a91f8473c2ddd2a8ff198cd7c92e
Merged-In: I2cdb8ce60939a91f8473c2ddd2a8ff198cd7c92e
(cherry picked from commit 9492b09d)