fbep: Fix ASIC present while checking power brake event (#2441)

Summary:
It was reversed

Pull Request resolved: facebookexternal/openbmc.quanta#2441

Test Plan: Build fbep pass

Reviewed By: GoldenBug

fbshipit-source-id: bcfa17551b

meta-facebook/meta-fbep/recipes-fbep/gpiod/files/gpiod.c

@@ -301,7 +301,7 @@ int check_pwr_brake()
     goto exit;
 
   for (i = 0; i < 8; i++) {
-    if (!is_asic_prsnt(7-i))
+    if (!is_asic_prsnt(i))
       continue;
 
     value = rbuf[0] & (0x1 << i);