cmake_hexagon: rpcmem and linking fix

This updates cmake_hexagon and cmake_hexagon inside DriverFramework
which fixes somethine about rpcmem.a and the double linking issue.

cmake_hexagon @ 3a88bd84

-Subproject commit 8d0790f8024fc3140031bf58d12549d6256dbdbc
+Subproject commit 3a88bd84de3850412e284477facdf9356dda0f5b

DriverFramework @ 8f9faa9b

-Subproject commit de43aa1ed6786a64f6993649d29902601862f4c7
+Subproject commit 8f9faa9b730ff9851cf38256ced5de86d5d0d593