msm: ipa3: changed testbus dump logic

The original testbus logic was not for sm8150_sdx55; it has been
altered and now is.

Change-Id: Ib371ce1d829fca798d16ffd4d23bc44f44b0e829
CRs-Fixed: 2435512
Signed-off-by: Perry Randise <prandise@codeaurora.org>