Convert CONFIG_SYS_CFI_FLASH_STATUS_POLL to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_CFI_FLASH_STATUS_POLL

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/3c120_defconfig b/configs/3c120_defconfig
index 617b25a..f266c0e 100644
--- a/configs/3c120_defconfig
+++ b/configs/3c120_defconfig
@@ -39,6 +39,7 @@
 CONFIG_DM_MTD=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_CFI_FLASH=y
+CONFIG_SYS_CFI_FLASH_STATUS_POLL=y
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_SYS_FLASH_PROTECTION=y
 CONFIG_SYS_FLASH_CFI=y