hw/tricore/triboard: Remove unnecessary use of &first_cpu

triboard_machine_init() has access to the single CPU via:

  TriBoardMachineState {
    TC27XSoCState {
      TriCoreCPU cpu;
      ...
    } tc27x_soc;
  } ms;

Pass it as argument to tricore_load_kernel() so we can
remove the &first_cpu global use.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Message-Id: <20250110180909.83165-1-philmd@linaro.org>

hw/tricore/triboard.c

@@ -31,11 +31,10 @@
 #include "hw/tricore/triboard.h"
 #include "hw/tricore/tc27x_soc.h"
 
-static void tricore_load_kernel(const char *kernel_filename)
+static void tricore_load_kernel(TriCoreCPU *cpu, const char *kernel_filename)
 {
     uint64_t entry;
     long kernel_size;
-    TriCoreCPU *cpu;
     CPUTriCoreState *env;
 
     kernel_size = load_elf(kernel_filename, NULL,
@@ -46,7 +45,6 @@ static void tricore_load_kernel(const char *kernel_filename)
         error_report("no kernel file '%s'", kernel_filename);
         exit(1);
     }
-    cpu = TRICORE_CPU(first_cpu);
     env = &cpu->env;
     env->PC = entry;
 }
@@ -62,7 +60,7 @@ static void triboard_machine_init(MachineState *machine)
     sysbus_realize(SYS_BUS_DEVICE(&ms->tc27x_soc), &error_fatal);
 
     if (machine->kernel_filename) {
-        tricore_load_kernel(machine->kernel_filename);
+        tricore_load_kernel(&ms->tc27x_soc.cpu, machine->kernel_filename);
     }
 }