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_rv32_spl_defconfig b/configs/ae350_rv32_spl_defconfig
index fffae6f..17e8fb7 100644
--- a/configs/ae350_rv32_spl_defconfig
+++ b/configs/ae350_rv32_spl_defconfig
@@ -34,6 +34,7 @@
 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