[RISCV] Remove unnecessary alias tests from rvzfh-aliases-valid.s. NFC

These are testing fmv.x.h and fmv.h.x which aren't aliases. This
appears to have been incorrectly copied from rvf-aliases-valid.s
where fmv.x.s and fmv.s.x are aliases for fmv.x.w and fmv.w.x.

Author: topperc

llvm/test/MC/RISCV/rvzfh-aliases-valid.s

@@ -40,13 +40,6 @@ fgt.h x4, f5, f6
 # CHECK-ALIAS: fle.h t2, fs1, fs0
 fge.h x7, f8, f9
 
-# CHECK-INST: fmv.x.h a2, fs7
-# CHECK-ALIAS: fmv.x.h a2, fs7
-fmv.x.h a2, fs7
-# CHECK-INST: fmv.h.x ft1, a6
-# CHECK-ALIAS: fmv.h.x ft1, a6
-fmv.h.x ft1, a6
-
 # CHECK-INST: flh ft0, 0(a0)
 # CHECK-ALIAS: flh ft0, 0(a0)
 flh f0, (x10)