RMX1971: Set default dexpreopt compiler filter to verify

PRODUCT_DEX_PREOPT_DEFAULT_COMPILER_FILTER attempts to compile all prebuilts fully optimised to speed level, thus the phone doesnt need to deal with it.
I also do know that this might be a trade-off on size, but I do see the first boot time is more worthy to trade-off.
The speed level mentioned here runs dex verification and compiles all AOT methods.

Prebuilt apps like Gmail/Google App, will be updated by google play, and there is no need spend time and space optimising what is going to be replaced.
Switch to Google's recommendation of using verify for an OTA package.
Applications still stay on speed.
Instead, replace the install profile with speed-profile making apps perform better.

Change-Id: I51760c503475bbd33cfe31d2cee0063756d18204
Signed-off-by: ij-israfil <israfilkhan494gmail.com>
Signed-off-by: kaderbava <ksbava7325@gmail.com>