mvebu: Move BOOTROM_ERR_REG out of CONFIG namespace

This register is referenced in one location and does not seem
configurable, so remove it from CONFIG namespace.

Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c
index 0272dd7..1e89377 100644
--- a/arch/arm/mach-mvebu/cpu.c
+++ b/arch/arm/mach-mvebu/cpu.c
@@ -91,7 +91,7 @@
 	 * be done, via the bootrom error register. Here the
 	 * MSB marks if the UART mode is active.
 	 */
-	val = readl(CONFIG_BOOTROM_ERR_REG);
+	val = readl(BOOTROM_ERR_REG);
 	boot_device = (val & BOOTROM_ERR_MODE_MASK) >> BOOTROM_ERR_MODE_OFFS;
 	debug("BOOTROM_REG=0x%08x boot_device=0x%x\n", val, boot_device);
 	if (boot_device == BOOTROM_ERR_MODE_UART)