net: bnge: add AUXILIARY_BUS to Kconfig dependencies

The build can currently fail with

    ld: drivers/net/ethernet/broadcom/bnge/bnge_auxr.o: in function `bnge_rdma_aux_device_add':
    bnge_auxr.c:(.text+0x366): undefined reference to `__auxiliary_device_add'
    ld: drivers/net/ethernet/broadcom/bnge/bnge_auxr.o: in function `bnge_rdma_aux_device_init':
    bnge_auxr.c:(.text+0x43c): undefined reference to `auxiliary_device_init'

if BNGE is enabled but no other driver pulls in AUXILIARY_BUS.

Select AUXILIARY_BUS in BNGE like in all other drivers which create
an auxiliary_device.

Fixes: 8ac050e ("bng_en: Add RoCE aux device support")
Signed-off-by: Markus Blöchl <[email protected]>
Reviewed-by: Vikas Gupta <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Markus Blöchl

drivers/net/ethernet/broadcom/Kconfig

@@ -259,6 +259,7 @@ config BNGE
 	depends on PCI
 	select NET_DEVLINK
 	select PAGE_POOL
+	select AUXILIARY_BUS
 	help
 	  This driver supports Broadcom ThorUltra 50/100/200/400/800 gigabit
 	  Ethernet cards. The module will be called bng_en. To compile this