target/m68k: Use cpu_*_mmuidx_ra instead of MMU_MODE{0,1}_SUFFIX

target/m68k: Use cpu_*_mmuidx_ra instead of MMU_MODE{0,1}_SUFFIX

The generated *_user functions are unused.  The *_kernel functions
have a couple of users in op_helper.c; use *_mmuidx_ra instead,
with MMU_KERNEL_IDX.

Tested-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Laurent Vivier <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
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v2: Use *_mmuidx_ra directly, without intermediate macros.