soc: nuvoton: numaker: m2l31x: fix hirc48m typo

Fix typo on HIRC48M. This clock source is required by:
- USB 1.1 OTG PHY
- USBD
- USBH
- OTG

Signed-off-by: Chun-Chieh Li <ccli8@nuvoton.com>
1 file changed