global: Move remaining CONFIG_SYS_NAND_* to CFG_SYS_NAND_*

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS_NAND
namespace do not easily transition to Kconfig. In many cases they likely
should come from the device tree instead. Move these out of CONFIG
namespace and in to CFG namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/siemens/taurus/taurus.c b/board/siemens/taurus/taurus.c
index 6c44afb..47d3f6a 100644
--- a/board/siemens/taurus/taurus.c
+++ b/board/siemens/taurus/taurus.c
@@ -41,8 +41,8 @@
 
 static void taurus_request_gpio(void)
 {
-	gpio_request(CONFIG_SYS_NAND_ENABLE_PIN, "nand ena");
-	gpio_request(CONFIG_SYS_NAND_READY_PIN, "nand rdy");
+	gpio_request(CFG_SYS_NAND_ENABLE_PIN, "nand ena");
+	gpio_request(CFG_SYS_NAND_READY_PIN, "nand rdy");
 	gpio_request(AT91_PIN_PA25, "ena PHY");
 }
 
@@ -73,10 +73,10 @@
 	       &smc->cs[3].mode);
 
 	/* Configure RDY/BSY */
-	at91_set_gpio_input(CONFIG_SYS_NAND_READY_PIN, 1);
+	at91_set_gpio_input(CFG_SYS_NAND_READY_PIN, 1);
 
 	/* Enable NandFlash */
-	at91_set_gpio_output(CONFIG_SYS_NAND_ENABLE_PIN, 1);
+	at91_set_gpio_output(CFG_SYS_NAND_ENABLE_PIN, 1);
 }
 
 #if defined(CONFIG_SPL_BUILD)
@@ -149,7 +149,7 @@
 		} else {
 			puts("erase spi flash sector 0\n");
 			spi_flash_erase(flash, 0,
-					CONFIG_SYS_NAND_U_BOOT_SIZE);
+					CFG_SYS_NAND_U_BOOT_SIZE);
 		}
 	}
 }