rebootescrow: use package as name

In order to provide a more descriptive name, and to be consistent
with HIDL, the stable AIDL package names are switching from
vintf-rebootescrow format to the package format
(android.hardware.rebootescrow).

Bug: N/A
Test: all build time
Change-Id: I76487b1a325cc4a4c26382cf553c2edf6c27389f