Add environment variables to control lint checks

Set ANDROID_LINT_CHECK to a comma-separated list of lint issues
that should be checked instead of the defaults.  This will disable
all lint checks and enable only the given list.

Set ANDROID_LINT_CHECK_EXTRA_MODULES to a list of modules that provide
lint checks that should added to all modules when ANDROID_LINT_CHECK
is specified.

Bug: 153485543
Test: m ANDROID_LINT_CHECK=JavaKotlinApiUsedByModule ANDROID_LINT_CHECK_EXTRA_MODULES=JavaKotlinApiFinder TARGET_BUILD_APPS=Gallery2 lint-check dist
Change-Id: Ifdf9bf972b8550104315b0f5e98b34ad699dcb67