Remove ro.com.google.clientidbase from exported prop list.

This property is GMS-specific. It should be set from either /system or /product.
After this change ro.com.google.clientidbase will have default_prop type and
will only be settable from an .rc file.

This property now must be set from system or product images. In case of a
system-only OTA, the old vendor.img might attempt set this property. This will
trigger a denial which is innocuous since the new system.img will correctly set
the property.

Bug: 117348096
Test: walleye can still set ro.com.google.clientidbase
Change-Id: Id0873baecacb4168415b1598c35af1ecbb411e17