riscv: misaligned: remove CONFIG_RISCV_M_MODE specific code

While reworking code to fix sparse errors, it appears that the
RISCV_M_MODE specific could actually be removed and use the one for
normal mode. Even though RISCV_M_MODE can do direct user memory access,
using the user uaccess helpers is also going to work. Since there is no
need anymore for specific accessors (load_u8()/store_u8()), we can
directly use memcpy()/copy_{to/from}_user() and get rid of the copy
loop entirely. __read_insn() is also fixed to use an unsigned long
instead of a pointer which was cast in __user address space. The
insn_addr parameter is now cast from unsigned lnog to the correct
address space directly.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20240206154104.896809-1-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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