target/riscv: Remove spaces from register names

These extra spaces make the "-d op" dump look weird.

Backports commit 7f9188e210aff6522a960d9669a583a3a752ddc0 from qemu
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Richard Henderson 2019-05-28 19:08:45 -04:00 committed by Lioncash
parent 68ce00ac2f
commit 9c1212f627
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