Revert "Changing the unit for the line height of text in notifications to sp"

This reverts commit ae7b653c.

Reason for revert: The change was trying to fix the same issue in b/264009793. We would like to follow the solution in b/264009793 and revert our fixing patches.

Change-Id: If28a4a1668cfa4a0f582afb8a64c60b228b460b5