bnxt_en: Refactor bnxt_hwrm_nvm_req()

bnxt_en: Refactor bnxt_hwrm_nvm_req()

bnxt_hwrm_nvm_req() first searches the nvm_params[] array for the
NVM parameter to set or get.  The array entry contains all the
NVM information about that parameter.  The information is then used
to send the FW message to set or get the parameter.

Refactor it to only do the array search in bnxt_hwrm_nvm_req() and
pass the array entry to the new function __bnxt_hwrm_nvm_req() to
send the FW message.  The next patch will be able to use the new
function.

Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20250310183129.3154117-3-michael.chan@broadcom.com
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>