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_xip_defconfig b/configs/ae350_rv64_xip_defconfig
index 49511ab..d4b2e63 100644
--- a/configs/ae350_rv64_xip_defconfig
+++ b/configs/ae350_rv64_xip_defconfig
@@ -33,6 +33,7 @@
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_SYS_FLASH_CFI_WIDTH_16BIT=y
 CONFIG_CFI_FLASH=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