liblog: do not check loggability of event logs before sending to logd

This code was introduced to help performance by skipping sending these
messages to logd when logd would later drop them.  However it has
multiple flaws:

1) Event logs aren't super common and non-loggable event logs are even
   less common, so it would be a trivial benefit if any.
2) This code is not particularly safe as written, which is even
   acknowledged in the comments.
3) This forces processes that write event logs to allocate a rather
   sizable amount of memory.

Therefore, it's better to simply remove this and let logd drop these
messages when it receives them.

Bug: 139705697
Test: logging works, liblog-unit-tests
Change-Id: Ide01574112e173d4922137b3d3868cf8c2c09086