configs: stm32mp1: Add support for baudrates higher than 115200 for st-link

On STMicroelectronics boards, the UART can reliably go up to
2000000 bauds when connected to the on-board ST-LINK-V2 for STM32MP15

Unfortunately U-Boot will fall back to 115200 unless higher rates are
declared via CONFIG_SYS_BAUDRATE_TABLE.

This patch add the support of higher baudrates on STMicroelectronics
boards with ST-LINK.

Cc: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/include/configs/stm32mp15_st_common.h b/include/configs/stm32mp15_st_common.h
index e8dad00..3c0ffb8 100644
--- a/include/configs/stm32mp15_st_common.h
+++ b/include/configs/stm32mp15_st_common.h
@@ -13,6 +13,11 @@
 
 #include <configs/stm32mp15_common.h>
 
+/* uart with on-board st-link */
+#define CONFIG_SYS_BAUDRATE_TABLE      { 9600, 19200, 38400, 57600, 115200, \
+					 230400, 460800, 921600, \
+					 1000000, 2000000 }
+
 #ifdef CONFIG_EXTRA_ENV_SETTINGS
 /*
  * default bootcmd for stm32mp1 STMicroelectronics boards: