linux-user: Remove target_elf_greg_t, tswapreg from elfload.c

These are no longer used within the generic file.

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

linux-user/elfload.c

@@ -130,14 +130,6 @@ int info_is_fdpic(struct image_info *info)
 #define ELF_DATA        ELFDATA2LSB
 #endif
 
-#ifdef TARGET_ABI_MIPSN32
-typedef abi_ullong      target_elf_greg_t;
-#define tswapreg(ptr)   tswap64(ptr)
-#else
-typedef abi_ulong       target_elf_greg_t;
-#define tswapreg(ptr)   tswapal(ptr)
-#endif
-
 #ifdef USE_UID16
 typedef abi_ushort      target_uid_t;
 typedef abi_ushort      target_gid_t;