power: Simplify soc_id checks

- Get soc_id in a common util function
 - Return boolean values for the target-specific soc_id checks

Change-Id: I038c435d28855859f36566de7acf881037d070f2

power-660.c

@@ -56,25 +56,20 @@ static int video_encode_hint_sent;
 
 static void process_video_encode_hint(void* metadata);
 
-/* Returns true is target is SDM630/SDM455 else false*/
-static bool is_target_SDM630() {
-    int fd;
-    bool is_target_SDM630 = false;
-    char buf[10] = {0};
-    fd = open("/sys/devices/soc0/soc_id", O_RDONLY);
-    if (fd >= 0) {
-        if (read(fd, buf, sizeof(buf) - 1) == -1) {
-            ALOGW("Unable to read soc_id");
-            is_target_SDM630 = false;
-        } else {
-            int soc_id = atoi(buf);
-            if (soc_id == 318 || soc_id == 327 || soc_id == 385) {
-                is_target_SDM630 = true; /* Above SOCID for SDM630/SDM455 */
-            }
-        }
-    }
-    close(fd);
-    return is_target_SDM630;
+/**
+ * If target is SDM630/SDM455:
+ *     return true
+ * else:
+ *     return false
+ */
+static bool is_target_SDM630(void) {
+    static bool is_SDM630 = false;
+    int soc_id;
+
+    soc_id = get_soc_id();
+    if (soc_id == 318 || soc_id == 327 || soc_id == 385) is_SDM630 = true;
+
+    return is_SDM630;
 }
 
 int power_hint_override(power_hint_t hint, void* data) {