[PATCH v1 2/3] arch: arm: lib: cache_v8: agilex5: Add weak function in cache_v8

[Ng, Boon Khai]

 > The callers of dcache_disable/etc should be doing:
> if (!CONFIG_IS_ENABLED(SYS_DCACHE_OFF))

Hi Tom, just get to know that the spl_atf.c already implemented
with the fix above, will follow the fix in spl_atf.c and submit in v2

https://github.com/u-boot/u-boot/blob/3526f990b
77fca1c933f1d8b24eb9385010a05bf/common/spl/spl_atf.c#L206

Thanks

Regards,
Boon Khai.