cpu,inv: rename logo -> isa_logo

src/cpu/inv.c

 #include "common.h"
 
 void display_inv_msg(vaddr_t pc) {
-  extern char logo [];
+  extern char isa_logo[];
   printf("There are two cases which will trigger this unexpected exception:\n"
       "1. The instruction at PC = 0x%08x is not implemented.\n"
       "2. Something is implemented incorrectly.\n", pc);
   printf("Find this PC(0x%08x) in the disassembling result to distinguish which case it is.\n\n", pc);
   printf("\33[1;31mIf it is the first case, see\n%s\nfor more details.\n\nIf it is the second case, remember:\n"
       "* The machine is always right!\n"
-      "* Every line of untested code is always wrong!\33[0m\n\n", logo);
+      "* Every line of untested code is always wrong!\33[0m\n\n", isa_logo);
 }

src/isa/mips32/logo.c

@@ -12,7 +12,7 @@
 
 */
 
-unsigned char logo[] = {
+unsigned char isa_logo[] = {
   0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
   0x5f, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
   0x5f, 0x5f, 0x5f, 0x5f, 0x20, 0x5f, 0x5f, 0x5f, 0x20, 0x20, 0x20, 0x20,

src/isa/riscv32/logo.c

@@ -10,7 +10,7 @@
 
 */
 
-unsigned char logo[] = {
+unsigned char isa_logo[] = {
   0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x5f, 0x20, 0x20, 0x20, 0x20,
   0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
   0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x5f, 0x5f, 0x20,

src/isa/x86/logo.c

@@ -10,7 +10,7 @@
 
 */
 
-unsigned char logo[] = {
+unsigned char isa_logo[] = {
   0x20, 0x5f, 0x20, 0x5f, 0x5f, 0x5f, 0x5f, 0x20, 0x20, 0x20, 0x5f, 0x5f,
   0x5f, 0x20, 0x20, 0x20, 0x20, 0x5f, 0x5f, 0x20, 0x20, 0x20, 0x20, 0x5f,
   0x5f, 0x20, 0x20, 0x5f, 0x5f, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,