Re-order virally misplaced namespace comments.

Noticed these were out of place when I tried to copy a file to use as a
template for a new file.

namespace android {
namespace aidl {
...
} // namespace android
} // namespace aidl

=>

namespace android {
namespace aidl {
...
} // namespace aidl
} // namespace android

Bug: N/A
Test: clang-format upload hook is happy
Change-Id: I2893b088c2a0e6b8fd2d09f0a11af5a0877599f1
21 files changed