make CRC32 boolean

mk/modules.mk

@@ -1736,10 +1736,6 @@ $(eval $(call KMOD_template,CRC16,crc16, \
 	$(MODULES_DIR)/kernel/lib/crc16 \
 ,01))
 
-$(eval $(call KMOD_template,CRC32,crc32, \
-	$(MODULES_DIR)/kernel/lib/crc32 \
-,01))
-
 #
 # parallel port support
 #

target/linux/config/Config.in.lib

@@ -18,7 +18,7 @@ config ADK_KERNEL_CRC16
 
 config ADK_KERNEL_CRC32
 	prompt "CRC32 library functions"
-	tristate
+	boolean
 	default n
 	help