CHW-2756: ANDU on AFF-A900 to 9.13.1P7 might pause due to prolonged firmware upgrade of the NVS module

Issue

• NVS module firmware upgrade might take significant long time, up to 1.5 hours

• [BMC> system log]
  [(...)]
  [Invalid NVRAM FW config. NVRAM FW will be updated.]
  [Loading NVRAM firmware version 1.1.1 (was 1.1.1.)]
  [Set successful for:id(NVRAM_FPGA); status(ONGOING); eta(2); err_code(0).]
  [Programming NVRAM FW...]
  [Programming meta for image 1]
  [Image 1 valid.]
  [Set successful for:id(NVRAM_FPGA); status(COMPLETED); eta(0); err_code(0).]
  [FWU registration for reboot.NVRAM_FPGA_FWUPDATE SUCCEEDED]
  [(...)]
  [bootarg.to.version="9.13.1P7"]
  [(...)]
  [FWU performs system reboot for post firmware update.]
  [.]
  [Uptime: 1h24m41s]
  

• [::> node run -node node1 -command sysconfig -a]
  BEFORE
  [    slot 6: NVRAM (NVRAM 11)]
  [(...)]
  [        Running Firmware:   1.1.1]
  [        MCU Revision:       1.4]
  

AFTER
[    slot 6: NVRAM (NVRAM 11)]
[(...)]
[        Running Firmware:   1.1.1]
[        MCU Revision:       1.5]