dev: pmic: pm8x41: Add support to read pmic revision id.

Change-Id: I0aad9bfdb186c9af338fbb11890d21a72b637ed3
diff --git a/dev/pmic/pm8x41/pm8x41.c b/dev/pmic/pm8x41/pm8x41.c
index f28dd91..62014ad 100644
--- a/dev/pmic/pm8x41/pm8x41.c
+++ b/dev/pmic/pm8x41/pm8x41.c
@@ -344,3 +344,9 @@
 
 	return 0;
 }
+
+uint8_t pm8x41_get_pmic_rev()
+{
+	return REG_READ(REVID_REVISION4);
+}
+