Revert "msm: ipc: Squashed updates from kk_2.7 branch"

This reverts commit af7503cdbd6b09a925541d8adb4ff6e0c5fcb7c6.
Revert "lib: qmi: Introduce QMI Encode/Decode library"

This reverts commit 99094f672afc7b76dbd55ad190b87155c358b681.
Revert "msm: hotplug: wait for hotplug completion event from secondary core"

This reverts commit b6ea333cf8086de9cb6cc72d68adce4e52d76d75.
Revert "msm: SSR: Fix problems with concurrent SSRs"

This reverts commit eb5c8b15b0221aa2c2c7875ed9a46e1f4582bd36.