power/pmic.h: Add prototype for power_init_board.

As this is a weak function that we may override, provide a prototype for
it.

Cc: Łukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Tom Rini <trini@ti.com>

include/power/pmic.h

@@ -79,6 +79,7 @@ struct pmic {
 };
 
 int pmic_init(unsigned char bus);
+int power_init_board(void);
 int pmic_dialog_init(unsigned char bus);
 int check_reg(struct pmic *p, u32 reg);
 struct pmic *pmic_alloc(void);