riscv: add Kconfig entries for the C and A ISA extensions
Add Kconfig entries for the C (compressed instructions) and A (atomic instructions) ISA extensions. Only the C ISA extension is selectable. This matches the configuration in Linux. The Kconfig entries are not used yet. A follow-up patch will select the appropriate compiler flags based on the Kconfig configuration. Signed-off-by: NLukas Auer <lukas.auer@aisec.fraunhofer.de> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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