cfg80211: select CONFIG_CRC32

Without crc32 support, this fails to link:

arm-linux-gnueabi-ld: net/wireless/scan.o: in function `cfg80211_scan_6ghz':
scan.c:(.text+0x928): undefined reference to `crc32_le'

Fixes: c8cb5b854b ("nl80211/cfg80211: support 6 GHz scanning")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/wireless/Kconfig

@@ -21,6 +21,7 @@ config CFG80211
 	tristate "cfg80211 - wireless configuration API"
 	depends on RFKILL || !RFKILL
 	select FW_LOADER
+	select CRC32
 	# may need to update this when certificates are changed and are
 	# using a different algorithm, though right now they shouldn't
 	# (this is here rather than below to allow it to be a module)