net/bnxt: support hot firmware upgrade for Stingray

net/bnxt: support hot firmware upgrade for Stingray

FW sets HWRM_FUNC_QCAPS_OUTPUT_FLAGS_ERR_RECOVER_RELOAD
in HWRM_FUNC_QCAPS command, if device requires to invoke
fastboot FW during FW reset.

Driver has to poll for shutdown bit in fw_status register:
1. in case of hot fw upgrade, this bit will be set after all
   function drivers unregistered with fw.
2. in case of fw initiated error recovery, this bit will be
   set after fw has collected the core dump

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Rahul Gupta <rahul.gupta@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>