sw64: gpu: correct low-level mmio memset/memcpy direct calls

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GDKC



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Driver codes of the direct calls, via the SIMD-optimized memset
and memcpy functions, may raise DFAULT when using RX580 or R7
Series graphics card on sw64, so work around 'memset' references
to '_memset_c_io' and 'memcpy' to 'memcpy_fromio'.

Signed-off-by: Xiong Aifei <xiongaifei@wxiat.com>

Signed-off-by: Gu Zitao <guzitao@wxiat.com>