掌機 - Miyoo A30 - Flush dcache、icache

參考資訊：
https://developer.arm.com/documentation/den0013/d/Caches/Invalidating-and-cleaning-cache-memory

dcache

void __clear_cache(char* beg, char* end);

icache

arm_icache_flush:
    mov r2, #0
    swi 0x9f0002
    mov pc, lr

P.S. 感謝Jack Lee的告知，如果是做JIT填寫Code，記得要64Bytes Alignment