disable enforce RRO for mainline devices

RROs are currently incompatible with exec-based spawning. This also
impacts the wrapper spawning model for the stock OS which is available
by default, making it an upstream bug rather than a missing feature for
exec-based spawning in GrapheneOS.

target/product/mainline_system.mk

@@ -115,7 +115,7 @@ PRODUCT_COPY_FILES += \
 # Enable dynamic partition size
 PRODUCT_USE_DYNAMIC_PARTITION_SIZE := true
 
-PRODUCT_ENFORCE_RRO_TARGETS := *
+#PRODUCT_ENFORCE_RRO_TARGETS := *
 
 PRODUCT_NAME := mainline_system
 PRODUCT_BRAND := generic