update_flash_nv: Display current FW version
update_flash_nv: Display current FW version

Add support to display current firmware version detail
on PowerKVM host.

Sample output:
[root@abc123 tmp]# update_flash -d
Current firwmare version :
  T side    : FW770.20 (ZL770_060)
  P side    : FW770.20 (ZL770_060)
  Boot side : FW770.20 (ZL770_060)

Suggested-by: Benjamin Herrenschmidt <a7089bb6e7e92505d88aaff006cbdd60cc9120b6@kernel.crashing.org>
Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>

leitao/powerpc-ibm-utils-debian,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian,kamalesh-babulal/powerpc-utils,mdroth/powerpc-utils,leitao/powerpc-ibm-utils-debian,mdroth/powerpc-utils,mdroth/powerpc-utils