r8169: add device specific CSI access helpers.
r8169: add device specific CSI access helpers.

New chipsets need it.

Signed-off-by: Hayes Wang <2e4abddca5cd1005ec71becebc17a5257b0bced7@realtek.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs