Convert CONFIG_SYS_NAND_ONFI_DETECTION to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_NAND_ONFI_DETECTION

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/cortina_presidio-asic-pnand_defconfig b/configs/cortina_presidio-asic-pnand_defconfig
index 51451fb..d635891 100644
--- a/configs/cortina_presidio-asic-pnand_defconfig
+++ b/configs/cortina_presidio-asic-pnand_defconfig
@@ -29,6 +29,7 @@
 CONFIG_MTD=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_CORTINA_NAND=y
+CONFIG_SYS_NAND_ONFI_DETECTION=y
 CONFIG_DM_SERIAL=y
 CONFIG_CORTINA_UART=y
 CONFIG_WDT=y