msm: ipa3: Disable gsi fifo and test bus registers

Update change to disable gsi fifo and gsi test bus
registers as these cannot be accessed through IPA_AP.

Change-Id: Icd7c85101a8997eff08acc98dbc1ead7b6067c81
Signed-off-by: Jagadeesh Ponduru <quic_jponduru@quicinc.com>