bsp: k230: define usbh_class_info section

When building with gcc, cherryusb requires start/end address
defined.

See components/drivers/usb/cherryusb/core/usbh_core.c

```c
    extern uint32_t __usbh_class_info_start__;
    extern uint32_t __usbh_class_info_end__;
    usbh_class_info_table_begin = (struct usbh_class_info *)&__usbh_class_info_start__;
    usbh_class_info_table_end = (struct usbh_class_info *)&__usbh_class_info_end__;
```

This patch should be upstreamed together with another 2 patches:
- "bsp: k230: add usb configurations"
- "components: cherryusb: support k230"

Signed-off-by: Wang Chen <[email protected]>

Author: unicornx

bsp/k230/link.lds

@@ -74,6 +74,11 @@ SECTIONS
         KEEP(*(UtestTcTab))
         __rt_utest_tc_tab_end = .;
 
+        . = ALIGN(8);
+        __usbh_class_info_start__ = .;
+        KEEP(*(.usbh_class_info))
+        __usbh_class_info_end__ = .;
+
         . = ALIGN(8);
         _etext = .;
     } > SRAM