msm_rmnet_bam: set name_assign_type in alloc_netdev

Commit c835a677 ("net: set name_assign_type in alloc_netdev()")
extended alloc_netdev to take name_assign_type as argument. Pass this
argument to ensure successful compilation of msm_rmnet_bam.

Change-Id: If7c7cc3c6e89432910e13eff00dd8646a898a135
Acked-by: Sharat Masetty <smasetty@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>