Handle loadDescription OutOfMemoryError in DeviceAdminInfo

loadDescription was potentially vulnerable to an attack which causes a
DoS exploit by injecting a maliciously large string into the Receiver's
label.

Bug: 443062265
Test: manual
Flag: EXEMPT BUGFIX
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:06a5b2327caa3aa8843496458e98b9bb070df6e5
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:8102beb663e3d7756e07e06f8c1ec025e1679b65
Merged-In: Icab26c4b77e73f0fcb9a560e3211482ebe2f37bf
Change-Id: Icab26c4b77e73f0fcb9a560e3211482ebe2f37bf