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When there is no reception (including no sim), still show the "Enable
Hotspot" button, but disable it instead. Provide context to user via
tooltip and sublabel the button as "Not Available".

This was tested by disabling Google Fi on my dev phone.

Screenshot:
No service: http://go/tscreen/fdb1d2ad6dd867d78bbd82b81cfd20cf7da69ac6
No SIM: https://screenshot.googleplex.com/Acq4YtHx2tjWfWp

Bug: 1159847, 1106937
Change-Id: Ib5dfc852d79e1b3a6be8153e31eced2c20e5e263
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606670
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839789}