logical partitions -> dynamic partitions

Reflect a name change.

* PRODUCT_USE_LOGICAL_PARTITIONS is deprecated and
will be removed in the future.

* ro.boot.dynamic_partitions is created. ro.boot.logical_partitions
will be removed once all the usage is removed.

Bug: 119286600
Test: builds

Change-Id: I5cb8bb1f5ebcee893fbef3a0f047c32de8773830