soc: qcom: bam_dmux: Reset SSR flags in bam_init

The modem crash during its first boot prior to the A2 initializing
break the BAM DMUX assumption that the modem will be able to successfully
boot the first time, so the SSR handling within BAM DMUX goes into wrong
state.

Reset the SSR flags in bam_init to handle the modem crash prior to A2
initialization case.

CRs-Fixed: 747645
Change-Id: I740ab33a806ff91f3b8f0b5477c30268680eff3a
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>