Convert CONFIG_SPL_NAND_LOAD et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_NAND_LOAD
   CONFIG_SYS_NAND_BLOCK_SIZE
   CONFIG_SYS_NAND_PAGE_SIZE
   CONFIG_SYS_NAND_OOBSIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/phycore-am335x-r2-regor_defconfig b/configs/phycore-am335x-r2-regor_defconfig
index 3de815c..af517c5 100644
--- a/configs/phycore-am335x-r2-regor_defconfig
+++ b/configs/phycore-am335x-r2-regor_defconfig
@@ -66,6 +66,9 @@
 CONFIG_MTD=y
 CONFIG_DM_MTD=y
 CONFIG_MTD_RAW_NAND=y
+CONFIG_SYS_NAND_BLOCK_SIZE=0x20000
+CONFIG_SYS_NAND_PAGE_SIZE=0x800
+CONFIG_SYS_NAND_OOBSIZE=0x40
 CONFIG_SYS_NAND_U_BOOT_LOCATIONS=y
 CONFIG_SYS_NAND_U_BOOT_OFFS=0x20000
 CONFIG_DM_SPI_FLASH=y