Revert "Set -fomit-frame-pointer for all devices"

This reverts commit 20823f95e6d90d7961b3c97ec57b4bcb2b8a24ab.

Reason for revert: caused a minor performance regression in some benchmarks.

Bug: 69470341
Test: builds
Change-Id: I1a852b5d7a2aa1d08ecb54617898f814cddd7600
diff --git a/cc/config/mips_device.go b/cc/config/mips_device.go
index 8b7bae3..9709ada 100644
--- a/cc/config/mips_device.go
+++ b/cc/config/mips_device.go
@@ -22,6 +22,7 @@
 
 var (
 	mipsCflags = []string{
+		"-fomit-frame-pointer",
 		"-Umips",
 	}