[v1.04][RISCV] Add Lichee PI 4a SoC (#200)

src/riscv/socs.h

@@ -11,6 +11,8 @@ enum {
   SOC_STARFIVE_VF2,
   // ALLWINNER
   SOC_ALLWINNER_D1H,
+  // SIPEED
+  SOC_SIPEED_LICHEEPI4A,
   // UNKNOWN
   SOC_MODEL_UNKNOWN
 };
@@ -19,6 +21,7 @@ inline static VENDOR get_soc_vendor_from_soc(SOC soc) {
   if(soc >= SOC_SIFIVE_U740 && soc <= SOC_SIFIVE_U740) return SOC_VENDOR_SIFIVE;
   if(soc >= SOC_STARFIVE_VF2 && soc <= SOC_STARFIVE_VF2) return SOC_VENDOR_STARFIVE;
   if(soc >= SOC_ALLWINNER_D1H && soc <= SOC_ALLWINNER_D1H) return SOC_VENDOR_ALLWINNER;
+  if(soc >= SOC_SIPEED_LICHEEPI4A && soc <= SOC_SIPEED_LICHEEPI4A) return SOC_VENDOR_SIPEED;
   return SOC_VENDOR_UNKNOWN;
 }