RISC-V: Simplify riscv_csr_address logic on state enable extensions

This commit makes CSR class handling for 'Smstateen' and 'Ssstateen'
extensions simpler using fall-throughs (as used in CSR_CLASS_I{,_32}).

gas/ChangeLog:

	* config/tc-riscv.c (riscv_csr_address): Simplify the logic for
	'Smstateen' and 'Ssstateen' extensions.
1 file changed