arm: omap: add support for am57xx devices

just add a few ifdefs around because this
device is very similar to dra7xxx.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Reviewed-by: Tom Rini <trini@ti.com>
diff --git a/drivers/power/palmas.c b/drivers/power/palmas.c
index cfbc9dc..6430fe0 100644
--- a/drivers/power/palmas.c
+++ b/drivers/power/palmas.c
@@ -27,7 +27,7 @@
 {
 	u8 val = 0;
 
-#if defined(CONFIG_DRA7XX)
+#if defined(CONFIG_DRA7XX) || defined(CONFIG_AM57XX)
 	/*
 	 * Currently valid for the dra7xx_evm board:
 	 * Set TPS659038 LDO1 to 3.0 V