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/ae350_rv64_spl_defconfig b/configs/ae350_rv64_spl_defconfig
index 2580bda..8c23eba 100644
--- a/configs/ae350_rv64_spl_defconfig
+++ b/configs/ae350_rv64_spl_defconfig
@@ -35,6 +35,7 @@
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_FLASH_CFI_DRIVER=y
 CONFIG_SYS_FLASH_CFI_WIDTH_16BIT=y
+CONFIG_SYS_CFI_FLASH_STATUS_POLL=y
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_SPI_FLASH_MACRONIX=y