soc: qcom: Force sequential boot for MSA modem

MSA boot of modem failed sporadically with parallel PIL loading
of blobs. Fix this by forcing msa based modem to perform sequential
loading of modem blobs.

Change-Id: Ie473a51ccb9aaae5484c811c6b9c6a35144c7fa2
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>