power: pmic_pca9450: fix PCA9450A I2C address

Quoting Ye Li from NXP:

    "We have confirmed with PMIC team, 0x35 is used only on early chips
    and not used any more. 0x25 is the final address."

Fix it by merging power_pca9450a_init and power_pca9450b_init into one
function power_pca9450_init.

Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
diff --git a/board/freescale/imx8mp_evk/spl.c b/board/freescale/imx8mp_evk/spl.c
index 3b3a854..3214718 100644
--- a/board/freescale/imx8mp_evk/spl.c
+++ b/board/freescale/imx8mp_evk/spl.c
@@ -68,7 +68,7 @@
 	struct pmic *p;
 	int ret;
 
-	ret = power_pca9450b_init(I2C_PMIC);
+	ret = power_pca9450_init(I2C_PMIC);
 	if (ret)
 		printf("power init failed");
 	p = pmic_get("PCA9450");