msm: ipa: crash on uc error

Before IPA uC crashes it generates an error event.
Add a BUG() when receiving this event to crash the device.

Change-Id: I652f49162fd9233babe1845ad54cc170c2fb3f77
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>