Print the default SOONG_ONLY value of the product in lunch output

SOONG_ONLY=false is currently printed as the output of lunch even for
enabled products such as `aosp_cf_x86_64_phone`.
config.soongOnlyRequested evaluates to true during the main build (it
invokes `runMakeProductConfig), but is currently always false when used
in report_config.

Test: lunch aosp_cf_x86_64_phone-trunk_staging-userdebug # SOONG_ONLY=true (previously
false)
Test: lunch cf_x86_64_phone-trunk_staging-userdebug # SOONG_ONLY=false

Bug: 402519768
Change-Id: If859695a583c6627af05fb62eb0f8b3fa93aeec8