x86: identify Hygon vendor

it's a Zen-based CPU: rely on AMD support code.

Change-Id: Ia980a42457575bf8d1130d813310a285bf137691
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3217
Reviewed-by: Adrien Destugues <[email protected]>

headers/os/kernel/OS.h

@@ -499,7 +499,8 @@ enum cpu_vendor {
 	B_CPU_VENDOR_VIA,
 	B_CPU_VENDOR_IBM,
 	B_CPU_VENDOR_MOTOROLA,
-	B_CPU_VENDOR_NEC
+	B_CPU_VENDOR_NEC,
+	B_CPU_VENDOR_HYGON
 };
 
 typedef struct {

headers/private/kernel/arch/x86/arch_cpu.h

@@ -481,6 +481,7 @@ enum x86_vendors {
 	VENDOR_RISE,
 	VENDOR_TRANSMETA,
 	VENDOR_NSC,
+	VENDOR_HYGON,
 
 	VENDOR_NUM,
 	VENDOR_UNKNOWN,

headers/private/shared/cpu_type.h

@@ -173,7 +173,7 @@ get_cpu_vendor_string(enum cpu_vendor cpuVendor)
 	// Should match vendors in OS.h
 	static const char* vendorStrings[] = {
 		NULL, "AMD", "Cyrix", "IDT", "Intel", "National Semiconductor", "Rise",
-		"Transmeta", "VIA", "IBM", "Motorola", "NEC"
+		"Transmeta", "VIA", "IBM", "Motorola", "NEC", "Hygon"
 	};
 
 	if ((size_t)cpuVendor >= sizeof(vendorStrings) / sizeof(const char*))