Move some flags to affect all devices

Move -fdata-sections and -fno-short-enums to global device flags.
-fdata-sections was not previously set on x86[_64], -fno-short-enums
was not previously set on mips[64].

Bug: 68855788
Test: m checkbuild
Change-Id: I68e64888d5414fc022366eb2b6c5cd92c28a5542

cc/config/x86_device.go

@@ -24,7 +24,6 @@ var (
 	x86Cflags = []string{
 		"-finline-functions",
 		"-finline-limit=300",
-		"-fno-short-enums",
 		"-funswitch-loops",
 	}