configs: stm32f769-disco: Set CYCLIC_MAX_CPU_TIME_US to 8000 for stm32f769-disco

Updating the framebuffer takes quite a long time on this slow patform,
set CYCLIC_MAX_CPU_TIME_US to 8000 for stm32f769-disco to avoid
following cyclic warning:

"cyclic function video_init took too long: 7280us vs 5000us max"

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/configs/stm32f769-disco_defconfig b/configs/stm32f769-disco_defconfig
index 1e09c22..5be221a 100644
--- a/configs/stm32f769-disco_defconfig
+++ b/configs/stm32f769-disco_defconfig
@@ -21,6 +21,7 @@
 CONFIG_BOOTARGS="console=ttyS0,115200 earlyprintk consoleblank=0 ignore_loglevel"
 CONFIG_SYS_PBSIZE=1050
 # CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_CYCLIC_MAX_CPU_TIME_US=8000
 CONFIG_SYS_PROMPT="U-Boot > "
 CONFIG_CMD_GPT=y
 CONFIG_CMD_MMC=y
diff --git a/configs/stm32f769-disco_spl_defconfig b/configs/stm32f769-disco_spl_defconfig
index 787571d..7d4bda4 100644
--- a/configs/stm32f769-disco_spl_defconfig
+++ b/configs/stm32f769-disco_spl_defconfig
@@ -30,6 +30,7 @@
 CONFIG_BOOTARGS="console=ttyS0,115200 earlyprintk consoleblank=0 ignore_loglevel"
 CONFIG_SYS_PBSIZE=1050
 # CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_CYCLIC_MAX_CPU_TIME_US=8000
 CONFIG_SPL_PAD_TO=0x9000
 CONFIG_SPL_NO_BSS_LIMIT=y
 CONFIG_SPL_BOARD_INIT=y