Correct SPL use of OCTEON_SERIAL_PCIE_CONSOLE

This converts 1 usage of this option to the non-SPL form, since there is
no SPL_OCTEON_SERIAL_PCIE_CONSOLE defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/mips/mach-octeon/cpu.c b/arch/mips/mach-octeon/cpu.c
index 5adf4ba..c7744e8 100644
--- a/arch/mips/mach-octeon/cpu.c
+++ b/arch/mips/mach-octeon/cpu.c
@@ -448,7 +448,7 @@
 	if (ret)
 		return ret;
 
-	if (CONFIG_IS_ENABLED(OCTEON_SERIAL_PCIE_CONSOLE))
+	if (IS_ENABLED(CONFIG_OCTEON_SERIAL_PCIE_CONSOLE))
 		init_pcie_console();
 
 	if (IS_ENABLED(CONFIG_OCTEON_SERIAL_BOOTCMD))