bnxt_en: Drop redundant if block in bnxt_dl_flash_update()

bnxt_en: Drop redundant if block in bnxt_dl_flash_update()

The devlink stack has sanity checks and it invokes flash_update()
only if it is supported by the driver.  The VF driver does not
advertise the support for flash_update in struct devlink_ops.
This makes if condition inside bnxt_dl_flash_update() redundant.

Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20250917040839.1924698-2-michael.chan@broadcom.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>