stm32mp1: configs: activate PRE_CONSOLE_BUFFER

Correctly handle silent=1 in the default environment.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index e5f05af..7efe464 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -47,6 +47,7 @@
 	imply BOOTSTAGE
 	imply CMD_BOOTCOUNT
 	imply CMD_BOOTSTAGE
+	imply PRE_CONSOLE_BUFFER
 	imply SILENT_CONSOLE
 	imply SYSRESET_PSCI if STM32MP1_TRUSTED
 	imply SYSRESET_SYSCON if !STM32MP1_TRUSTED
@@ -110,6 +111,13 @@
 		fuse public key hash in corresponding fuse used to authenticate
 		binary.
 
+
+config PRE_CON_BUF_ADDR
+	default 0xC02FF000
+
+config PRE_CON_BUF_SZ
+	default 4096
+
 config BOOTSTAGE_STASH_ADDR
 	default 0xC3000000