If deviceEntryIconView isn't visible, clickable=false

In general, the device entry icon view should still be clickable
for switch access users when it is visible.

Bug: 341916203
Flag: EXEMPT bugfix
Test: on a UDFPS device, swipe down on the home screen
in the UDFPS icon area. Notice that the notification
shade can expand from this location.

(cherry picked from commit 14b3cc4f)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:2eb580106912d826e52991eb381c4fae96f5a6e6)
Merged-In: I151b989dde4f585f2c429c3436bb7307feb58234
Change-Id: I151b989dde4f585f2c429c3436bb7307feb58234