SWDEV-283266 - Add hiprtc option to generate preprocessor expansion

Add -r/--generate_rtc option to hip_embed_pch.sh to generate the
preprocessor expansion output of the HIP headers for hipRTC mode.
Generates an object hiprtc_header.o and shared library libhiprtc.so
which can be used for hipRTC online compilations. Enable
__HIP_ENABLE_RTC by default in the CMake files.

Change-Id: Ief51b695c9b31941d929e06f16872f95eea3619b

hipamd/packaging/hip-rocclr.txt

@@ -33,6 +33,10 @@ install(FILES @PROJECT_BINARY_DIR@/.hipInfo DESTINATION lib)
 install(FILES @PROJECT_BINARY_DIR@/hip-config.cmake @PROJECT_BINARY_DIR@/hip-config-version.cmake DESTINATION lib/cmake/hip)
 install(FILES @PROJECT_BINARY_DIR@/rocclr/hip-lang-config.cmake @PROJECT_BINARY_DIR@/rocclr/hip-lang-config-version.cmake DESTINATION lib/cmake/hip-lang)
 
+if(@__HIP_ENABLE_RTC@)
+  install(FILES @PROJECT_BINARY_DIR@/lib/libhiprtc-builtins.so.@HIP_LIB_VERSION_MAJOR@.@HIP_LIB_VERSION_MINOR@ DESTINATION lib)
+endif()
+
 #############################
 # Rocclr install
 #############################