arm64: phytium: Add CPU Implementer Phytium

This patch adds 0x70 check for phytium implementer id in function
parse_cpu_details. Also adds that Phytium Soc is not vulnerable to variant 3/3a

spectre-meltdown-checker.sh

@@ -467,6 +467,10 @@ is_cpu_vulnerable()
 		variant3=immune
 		variant3a=immune
 		variantl1tf=immune
+	elif [ "$cpu_vendor" = PHYTIUM ]; then
+		variant3=immune
+		variant3a=immune
+		variantl1tf=immune
 	elif [ "$cpu_vendor" = ARM ]; then
 		# ARM
 		# reference: https://developer.arm.com/support/security-update
@@ -688,6 +692,8 @@ is_cpu_mds_free()
 		return 0
 	elif [ "$cpu_vendor" = CAVIUM ]; then
 		return 0
+	elif [ "$cpu_vendor" = PHYTIUM ]; then
+		return 0
 	elif [ "$cpu_vendor" = ARM ]; then
 		return 0
 	fi
@@ -1572,6 +1578,8 @@ parse_cpu_details()
 
 		elif grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x43' "$procfs/cpuinfo"; then
 			cpu_vendor='CAVIUM'
+		elif grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x70' "$procfs/cpuinfo"; then
+			cpu_vendor='PHYTIUM'
 		fi
 
 		cpu_family=$(  grep '^cpu family' "$procfs/cpuinfo" | awk '{print $4}' | grep -E '^[0-9]+$' | head -1)