msm: hotplug: Protect suspend operations by mutex

Change-Id: I11e7b39f645ce333c4d360efd6435d54e3f01f6b
Revert "msm: hotplug: Protect suspend operations by mutex"

This reverts commit 7a879c677475f302ef8b1581d363b0fe676f9a11.

Change-Id: Ia451610310d9a3e4efbde7776e5aa02d235a5bf1