staging: rtl819x: select CONFIG_CRC32

staging: rtl819x: select CONFIG_CRC32

Without crc32 support, the drivers fail to link:

ERROR: modpost: "crc32_le" [drivers/staging/rtl8192e/rtllib_crypt_wep.ko] undefined!
ERROR: modpost: "crc32_le" [drivers/staging/rtl8192e/rtllib_crypt_tkip.ko] undefined!
ERROR: modpost: "crc32_le" [drivers/staging/rtl8192u/r8192u_usb.ko] undefined!

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20210103214034.1995821-1-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>