common: board_f: vid: Add VID specific API to adjust core voltage

Adds a VID specific API in init_sequence_f and spl code flow
namely init_func_vid which is required to adjust core voltage.

VID specific code is required in spl, hence moving flag CONFIG_VID
out of spl flags.

Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/include/common.h b/include/common.h
index 4362000..0fe9439 100644
--- a/include/common.h
+++ b/include/common.h
@@ -364,6 +364,9 @@
 
 int	misc_init_f   (void);
 int	misc_init_r   (void);
+#if defined(CONFIG_VID)
+int	init_func_vid(void);
+#endif
 
 /* common/exports.c */
 void	jumptable_init(void);