Remove MODULE_LICENSE_APACHE2 from tools/build

Repositories containing third-party code need a METADATA and a
license_type. Repositories containing only first-party code no longer
need a MODULE_LICENSE_* file.

All non-Apache2 code appears in test code--not code to build and
distribute.

Bug: 68860345
Bug: 69058154
Bug: 151953481

Test: no code changes

Exempt-From-Owner-Approval: janitorial work
Change-Id: I36c46b79d83a295e79bb13250e39377cc4ffb62b
diff --git a/builder/MODULE_LICENSE_APACHE2 b/builder/MODULE_LICENSE_APACHE2
deleted file mode 100644
index e69de29..0000000
--- a/builder/MODULE_LICENSE_APACHE2
+++ /dev/null
diff --git a/gradle/MODULE_LICENSE_APACHE2 b/gradle/MODULE_LICENSE_APACHE2
deleted file mode 100644
index e69de29..0000000
--- a/gradle/MODULE_LICENSE_APACHE2
+++ /dev/null