Revert "Set min_sdk_version for java imports in pom2bp"

Revert "Give pom2bp -default-min-sdk-version 24 param"

Revert submission 1662079-axd

Bug: 184656328
Reason for revert: Break build
Reverted Changes:
I2f4dc7585:Update androidx min_sdk_version in allowed_deps
I5cb8c736d:Give pom2bp -default-min-sdk-version 24 param
I3b029315a:Set min_sdk_version for java imports in pom2bp

Change-Id: Ic97cbd1714f6113188ad4647ce71105f9641fad7