x86: ivybridge: Rename lpc_init() to lpc_init_extra()

In preparation for adding an init() method to the LPC uclass, rename this
existing function so that it will not conflict.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/ivybridge/lpc.c b/arch/x86/cpu/ivybridge/lpc.c
index 9dad9e4..9f41f22 100644
--- a/arch/x86/cpu/ivybridge/lpc.c
+++ b/arch/x86/cpu/ivybridge/lpc.c
@@ -538,7 +538,7 @@
 	return 0;
 }
 
-int lpc_init(struct pci_controller *hose, pci_dev_t dev)
+int lpc_init_extra(struct pci_controller *hose, pci_dev_t dev)
 {
 	const void *blob = gd->fdt_blob;
 	int node;