km/common: move ivm functions from to ivm.c

The file common.c grows in the past. So move the IVM specific
code into an ivm.c file.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Heiko Schocher <hs@denx.de>
cc: Wolfgang Denk <wd@denx.de>
diff --git a/board/keymile/common/common.h b/board/keymile/common/common.h
index cee24d4..edf6e3a 100644
--- a/board/keymile/common/common.h
+++ b/board/keymile/common/common.h
@@ -138,4 +138,5 @@
 				void **var);
 
 int i2c_soft_read_pin(void);
+int i2c_make_abort(void);
 #endif /* __KEYMILE_COMMON_H */