stm32mp1: Move config SYS_MALLOC_LEN to Kconfig

This patch moves the the config SYS_MALLOC_LEN to
Kconfig as it is already done for zynq arch in
commit 01aa5b8f0503 ("Kconfig: Move config
SYS_MALLOC_LEN to Kconfig for zynq")

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/Kconfig b/Kconfig
index 5f5c5cc..fcde0c3 100644
--- a/Kconfig
+++ b/Kconfig
@@ -147,7 +147,7 @@
 
 config SYS_MALLOC_LEN
 	hex "Define memory for Dynamic allocation"
-	depends on ARCH_ZYNQ || ARCH_VERSAL
+	depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP
 	help
 	  This defines memory to be allocated for Dynamic allocation
 	  TODO: Use for other architectures
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index 73aa382..39a2a32 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -23,6 +23,9 @@
 config SYS_SOC
 	default "stm32mp"
 
+config SYS_MALLOC_LEN
+	default 0x2000000
+
 config TARGET_STM32MP1
 	bool "Support stm32mp1xx"
 	select ARCH_SUPPORT_PSCI if !STM32MP1_TRUSTED
diff --git a/include/configs/stm32mp1.h b/include/configs/stm32mp1.h
index fd6c97a..1d82537 100644
--- a/include/configs/stm32mp1.h
+++ b/include/configs/stm32mp1.h
@@ -23,11 +23,6 @@
 #endif
 
 /*
- * malloc() pool size
- */
-#define CONFIG_SYS_MALLOC_LEN			SZ_32M
-
-/*
  * Configuration of the external SRAM memory used by U-Boot
  */
 #define CONFIG_SYS_SDRAM_BASE			STM32_DDR_BASE