Windows-on-ARM64: [ARM64EC] Fix Makefile

C source files in common/aarch64 are accidentally removed from Makefile
by the commit below, adding them back.

commit 23b112a1
Author: Zhaoshi Zheng <zhaoshiz@quicinc.com>
Date:   Tue May 21 15:07:42 2024

    Windows-on-ARM64: [ARM64EC] Initial support to build asm sources