soc: common: riscv-privileged: add riscv_clic_irq_vector_set() for clic

Introduce riscv_clic_irq_vector_set() to implement z_riscv_irq_vector_set()
for CLIC. This commit also introduces CONFIG_CLIC_SMCLICSHV_EXT to indicate
support for the smclicshv extenion and riscv_clic_irq_vector_set().

Signed-off-by: Jimmy Zheng <jimmyzhe@andestech.com>