msm: ipa3: Changes to read the halt command return code after some delay

In some cases for updating the return code in SCRATCH register taking
time after raising the global interrupt. Adding changes to wait for
some time read the SCRATCH register again and also printing the
test bus registers and Q6 channel state in failed scenario.

Change-Id: I4112a2290739daa79629f718d9725258518aba4c
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>