msm: ipa3: Fix to avoid using ieob mask wa in bengal target

No need of explicit check for IEOB interrupt after enabling
it. Hardware support is present in bengal target. Add changes
to skip the workaround for bengal target.

Change-Id: I393f27ec931b39ba09b96d830beda65b9e15d323
Signed-off-by: Praveen Kurapati <pkurapat@codeaurora.org>