Install cppreopts.sh to copy dexpreopt files on first boot

This relands https://r.android.com/3205048 without the
`BOARD_USES_SYSTEM_OTHER_ODEX` conditional. Board config runs after
product config, so the value of `BOARD_USES_SYSTEM_OTHER_ODEX` is not
available in runtime_libart.mk

Adding cppreopts.sh to PRODUCT_PACKAGES ensures that the dexpreopt files
can be copied from system_other to /data on first boot.

Test: lunch aosp_cheetah-trunk_staging-userdebug
Test: get_build_var PRODUCT_SYSTEM_PROPERTIES # verified that ro.cp_system_other_odex=1 is present
(this was incorrectly removed from build.prop after
https://r.android.com/3205048)

Test: device boot test go/abtd https://android-build.corp.google.com/builds/abtd/run/L83800030005663221
(this failed previously with https://r.android.com/3205048)

Bug: 356075780
Change-Id: I6a596373bbbe8587620c5867fb43fcbf3f3b2b2b