target/arm: Use cpu_*_data_ra for sve_ldst_tlb_fn

target/arm: Use cpu_*_data_ra for sve_ldst_tlb_fn

Use the "normal" memory access functions, rather than the
softmmu internal helper functions directly.

Since fb901c905dc3, cpu_mem_index is now a simple extract
from env->hflags and not a large computation.  Which means
that it's now more work to pass around this value than it
is to recompute it.

This only adjusts the primitives, and does not clean up
all of the uses within sve_helper.c.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200508154359.7494-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>