Convert CONFIG_SYS_NAND_NO_SUBPAGE_WRITE to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_NAND_NO_SUBPAGE_WRITE

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/k2l_evm_defconfig b/configs/k2l_evm_defconfig
index e28054b..bb91aa3 100644
--- a/configs/k2l_evm_defconfig
+++ b/configs/k2l_evm_defconfig
@@ -78,6 +78,7 @@
 CONFIG_MTD=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_SYS_NAND_USE_FLASH_BBT=y
+CONFIG_SYS_NAND_NO_SUBPAGE_WRITE=y
 CONFIG_NAND_DAVINCI=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SF_DEFAULT_SPEED=30000000