Remove unnecessary overflow check for BFD_RELOC_RISCV_CVPCREL_(UI12 & URS1)

gas/ChangeLog.COREV:

	* config/tc-riscv.c (md_apply_fix): Remove unnecessary overflow check
	for BFD_RELOC_RISCV_CVPCREL_UI12 & BFD_RELOC_RISCV_CVPCREL_URS1.

gas/testsuite/ChangeLog.COREV:

	* gas/riscv/cv-hwlp-fail-operand-07.l: Remove obsolete
	BFD_RELOC_RISCV_CVPCREL_UI12 overflow error message.

Signed-off-by: Jessica Mills <jessica.mills@embecosm.com>