msm8660: Enable debug.egl.recordable.rgba8888 prop

This fixes EGL errors with the MR1 Adreno blobs, and subsequently fixes
the black screen in Subway Surfers and other apps.

https://android.googlesource.com/device/lge/mako/+/4cac3659d68161514f11a18b5ff953f6165ddcff

Big thanks to Johnnyslt for finding this fix