mfd: Switch WM8350 revision detection to a feature based model

Rather than check for chip revisions in the WM8350 drivers have the core
code set flags for relevant differences.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
diff --git a/drivers/power/wm8350_power.c b/drivers/power/wm8350_power.c
index 9c0a847..74e7593 100644
--- a/drivers/power/wm8350_power.c
+++ b/drivers/power/wm8350_power.c
@@ -44,7 +44,7 @@
 
 static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
 {
-	if (wm8350->rev < WM8350_REV_G)
+	if (!wm8350->power.rev_g_coeff)
 		return (((min - 30) / 15) & 0xf) << 8;
 	else
 		return (((min - 30) / 30) & 0xf) << 8;