soc: arm: stm32: Add support for STM32L151XB-A SoC

STM32L151XB-A SoC is almost similar to the STM32L151XB SoC except that
it has more RAM (32KiB). Hence add devicetree and Kconfig support.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

soc/arm/st_stm32/stm32l1/Kconfig.defconfig.stm32l151xba

@@ -0,0 +1,31 @@
+# Kconfig - ST Microelectronics STM32L151XB-A MCU
+#
+# Copyright (c) 2019 Linaro Ltd.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if SOC_STM32L151XBA
+
+config SOC
+	string
+	default "stm32l151xba"
+
+config NUM_IRQS
+	int
+	default 45
+
+if GPIO_STM32
+
+config GPIO_STM32_PORTD
+	default y
+
+config GPIO_STM32_PORTE
+	default y
+
+config GPIO_STM32_PORTH
+	default y
+
+endif # GPIO_STM32
+
+endif # SOC_STM32L151XBA

soc/arm/st_stm32/stm32l1/Kconfig.soc

@@ -15,4 +15,7 @@ config SOC_STM32L151X8A
 config SOC_STM32L151XB
 	bool "STM32L151XB"
 
+config SOC_STM32L151XBA
+	bool "STM32L151XBA"
+
 endchoice