Revert "Enable io_uring feature for virtual A/B OTA"

This reverts commit f72860ce.

Reason for revert: http://b/219642530 - I/O failures seen on one specific device intermittently. Let's pause this; I will revisit it before we land it back as we don't want to hold dogfood builds.

Change-Id: I3a80ccf5f67daed01d5b2e6a502e8acea85a769f