soc: stm32: Adds support for STM32F401XD variants

Introduces config file entries for STM32F401XD variants. The
STM32F401XD family is related to the STM32F401XE family but with a
reduced flash memory.

Signed-off-by: Ricardo Rivera-Matos <ricardo.rivera-matos@cirrus.com>

soc/st/stm32/soc.yml

@@ -43,6 +43,7 @@ family:
   - name: stm32f4x
     socs:
     - name: stm32f401xc
+    - name: stm32f401xd
     - name: stm32f401xe
     - name: stm32f405xx
     - name: stm32f407xx

soc/st/stm32/stm32f4x/Kconfig.defconfig.stm32f401xd

@@ -0,0 +1,11 @@
+# ST STM32F401xD MCU configuration options
+
+# Copyright (c) 2025 Cirrus Logic, Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_STM32F401XD
+
+config NUM_IRQS
+	default 85
+
+endif # SOC_STM32F401XD

soc/st/stm32/stm32f4x/Kconfig.soc

@@ -14,6 +14,10 @@ config SOC_STM32F401XC
 	bool
 	select SOC_SERIES_STM32F4X
 
+config SOC_STM32F401XD
+	bool
+	select SOC_SERIES_STM32F4X
+
 config SOC_STM32F401XE
 	bool
 	select SOC_SERIES_STM32F4X
@@ -100,6 +104,7 @@ config SOC_STM32F479XX
 
 config SOC
 	default "stm32f401xc" if SOC_STM32F401XC
+	default "stm32f401xd" if SOC_STM32F401XD
 	default "stm32f401xe" if SOC_STM32F401XE
 	default "stm32f405xx" if SOC_STM32F405XX
 	default "stm32f407xx" if SOC_STM32F407XE