net/bnxt: add driver register/unregister

net/bnxt: add driver register/unregister

Move init() cleanup into uninit() function
Fix .dev_private_size

New HWRM calls:
bnxt_hwrm_func_driver_register:
	This command is used by the function driver to register
	its information with the HWRM.

bnxt_hwrm_func_driver_unregister:
	This command is used by the function driver to unregister
	with the HWRM.

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Stephen Hurd <stephen.hurd@broadcom.com>
Reviewed-by: David Christensen <david.christensen@broadcom.com>