kconfig: move CONFIG_CMD_CRC32 to Kconfig

Since CONFIG_CMD_CRC32 is defined in config_cmd_defaults.h,
it is enabled for all the boards except the ones undefining it
explicitly:
  kwb
  tseries_mmc
  tseries_nand
  tseries_spi
  vct_platinum_onenand_small
  vct_platinum_small
  vct_platinumavc_onenand_small
  vct_platinumavc_small
  vct_premium_onenand_small
  vct_premium_small

The default value of this config option should be "y" and
"# CONFIG_CMD_CRC32 is not set" should be added for those exceptions.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/tseries_nand_defconfig b/configs/tseries_nand_defconfig
index 599d52c..bd06d83 100644
--- a/configs/tseries_nand_defconfig
+++ b/configs/tseries_nand_defconfig
@@ -2,3 +2,4 @@
 CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1,NAND"
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_TSERIES=y
+# CONFIG_CMD_CRC32 is not set