risc-v: call plic_init_hart() unconditionally

The function plic_init_hart() is part of the internal kernel API, so
every SOC's PLIC implementation has to provide it, even if it is
empty.

Signed-off-by: Axel Heider <axel.heider@hensoldt-cyber.de>

src/arch/riscv/machine/hardware.c

@@ -237,10 +237,8 @@ BOOT_CODE void initLocalIRQController(void)
 {
     printf("Init local IRQ\n");
 
-#ifdef CONFIG_PLAT_HIFIVE
     /* Init per-hart PLIC */
     plic_init_hart();
-#endif
 
     /* Enable timer and external interrupt. If SMP is enabled, then enable the
      * software interrupt also, it is usec as IPI between cores. */