fix: 修复非arm架构找不到memcpy的问题

Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: I7e93b2210ba22c33886f31b1f4d41ce5388d4a09

porting/liteos_m/kernel/src/string/memcpy.c

-#if __ARMEB__
+#if !__ARMEL__
 #include <string.h>
 #include <stdint.h>
 #include <endian.h>