target-sparc: Fix mixup of uint64 and uint64_t

Commit 793a137a (target-sparc:
Implement BMASK/BSHUFFLE.) introduced a stray usage of softfloat uint64
type.

Use uint64_t instead.
Signed-off-by: NAndreas Färber <afaerber@suse.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

target-sparc/vis_helper.c

@@ -459,7 +459,7 @@ uint32_t helper_fpackfix(uint64_t gsr, uint64_t rs2)
     return ret;
 }
 
-uint64 helper_bshuffle(uint64_t gsr, uint64_t src1, uint64_t src2)
+uint64_t helper_bshuffle(uint64_t gsr, uint64_t src1, uint64_t src2)
 {
     union {
         uint64_t ll[2];