riscv: Rename Andes PLIC to PLICSW

As PLICSW is used to trigger the software interrupt, we should rename
Andes PLIC configuration and file name to reflect the usage. This patch
also updates PLMT and PLICSW compatible strings to be consistent with
OpenSBI fdt driver.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/arch/riscv/cpu/ax25/Kconfig b/arch/riscv/cpu/ax25/Kconfig
index 941d963..4a7295d 100644
--- a/arch/riscv/cpu/ax25/Kconfig
+++ b/arch/riscv/cpu/ax25/Kconfig
@@ -4,7 +4,7 @@
 	imply CPU
 	imply CPU_RISCV
 	imply RISCV_TIMER if (RISCV_SMODE || SPL_RISCV_SMODE)
-	imply ANDES_PLIC if (RISCV_MMODE || SPL_RISCV_MMODE)
+	imply ANDES_PLICSW if (RISCV_MMODE || SPL_RISCV_MMODE)
 	imply ANDES_PLMT_TIMER if (RISCV_MMODE || SPL_RISCV_MMODE)
 	imply SPL_CPU
 	imply SPL_OPENSBI