Provide API to read/write bootrom configuration from/to NVRAM.
EFSYS_OPT_BOOTROM should be enabled to use it.
From Solarflare Communications Inc.
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
