[WCNCR00146539] misc: remove unused wnm.c file

[Description]
Remove unused wnm.c file to clean driver

Change-Id: I9446c5525db4a065b0c7339b6fe21d7069df03b2
Feature: misc
Signed-off-by: Awk Jiang <awk.jiang@mediatek.com>
CR-Id: WCNCR00146539
1 file changed