drivers: allwinner: axp: Add AXP805 support

This adds the new regulator list, as well as changes to make the switch
(equivalent to DC1SW on the AXP803) work on both PMICs.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: I9a1eac8ddfc54b27096c10a8eebdd51aaf9b8311
diff --git a/include/drivers/allwinner/axp.h b/include/drivers/allwinner/axp.h
index f3d6277..9c0035f 100644
--- a/include/drivers/allwinner/axp.h
+++ b/include/drivers/allwinner/axp.h
@@ -13,6 +13,7 @@
 
 enum {
 	AXP803_CHIP_ID = 0x41,
+	AXP805_CHIP_ID = 0x40,
 };
 
 struct axp_regulator {