USB: ehci_hcd: Don't panic on receiving FATAL ERROR

"commit 105d07f EHCI: HSIC: Add debug support for HSIC system error"
 has introduced panic() on receiving FATAL STATUS interrupt. For OTG
and 2nd/3rd HSUSB instance this panic() is not required as the system
can be functional with USB system error, hence avoiding this panic()
for OTG and 2nd/3rd HSUSB instances.

CRs-Fixed: 447040
Change-Id: I94dc63c5e8ac612ce9bbe42d2ef8266816be2693
Signed-off-by: Chiranjeevi Velempati <cvelempa@codeaurora.org>