arch: add loongson2_mmi.sh for MMI-enabled Loongson 2F

- See https://wiki.aosc.io/en/minutes-20200510#on-loongson.
AOSC-Archive · May 10, 2020 · 66bb182 · 66bb182
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commit 66bb182
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diff --git a/arch/loongson2_mmi.sh b/arch/loongson2_mmi.sh
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+#!/bin/bash
+##arch/loongson2_mmi.sh: Optimisation overlay for MMI-enabled Loongson2 (2F).
+##@copyright GPL-2.0+
+CFLAGS_COMMON_ARCH=' -march=loongson2f -mloongson-mmi '