bdinfo: sh: arc: Drop arch-specific print_bi_mem()

It isn't worth having arch-specific code for such minor output
differences. In fact it is better if all archs are consistent.

Drop the arch-specific code in print_bi_mem() and inline it to avoid a
two-line function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Alexey Brodkin <abrodkin@synopsys.com>