hv:fix MISRA-C return value violation

1) Change these 5 APIs to void type:
   vcpu_inject_pf
   uart16550_calc_baud_div
   uart16550_set_baud_rate
   console_init
   ptdev_activate_entry
No need to return 'entry' for ptdev_activate_entry
since the input parameter is 'entry'.
2) no need to check return value for the caller
   such as sbuf_put/console_putc/serial_puts/serial_get_rx_data

Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>

hypervisor/debug/printf.c

@@ -28,7 +28,7 @@ static int charout(int cmd, const char *s, int sz, void *hnd)
 	/* fill mode */
 		*nchars += sz;
 		while (sz != 0) {
-			console_putc(*s);
+			(void)console_putc(*s);
 			sz--;
 		}
 	}