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>
diff --git a/soc/nuvoton/numaker/m2l31x/soc.c b/soc/nuvoton/numaker/m2l31x/soc.c
index e722496..66c877f 100644
--- a/soc/nuvoton/numaker/m2l31x/soc.c
+++ b/soc/nuvoton/numaker/m2l31x/soc.c
@@ -57,14 +57,14 @@
 	/* Wait for LIRC clock ready */
 	CLK_WaitClockReady(CLK_STATUS_LIRCSTB_Msk);
 
-#if DT_NODE_HAS_PROP(DT_NODELABEL(scc), hirc48)
-	/* Enable/disable 48 MHz high-speed internal RC oscillator (HIRC48) */
-	if (DT_ENUM_IDX(DT_NODELABEL(scc), hirc48) == NUMAKER_SCC_CLKSW_ENABLE) {
-		CLK_EnableXtalRC(CLK_PWRCTL_HIRC48EN_Msk);
-		/* Wait for HIRC48 clock ready */
-		CLK_WaitClockReady(CLK_STATUS_HIRC48STB_Msk);
-	} else if (DT_ENUM_IDX(DT_NODELABEL(scc), hirc48) == NUMAKER_SCC_CLKSW_DISABLE) {
-		CLK_DisableXtalRC(CLK_PWRCTL_HIRC48EN_Msk);
+#if DT_NODE_HAS_PROP(DT_NODELABEL(scc), hirc48m)
+	/* Enable/disable 48 MHz high-speed internal RC oscillator (HIRC48M) */
+	if (DT_ENUM_IDX(DT_NODELABEL(scc), hirc48m) == NUMAKER_SCC_CLKSW_ENABLE) {
+		CLK_EnableXtalRC(CLK_PWRCTL_HIRC48MEN_Msk);
+		/* Wait for HIRC48M clock ready */
+		CLK_WaitClockReady(CLK_STATUS_HIRC48MSTB_Msk);
+	} else if (DT_ENUM_IDX(DT_NODELABEL(scc), hirc48m) == NUMAKER_SCC_CLKSW_DISABLE) {
+		CLK_DisableXtalRC(CLK_PWRCTL_HIRC48MEN_Msk);
 	}
 #endif