ARM: dts: stm32: Add gpio-keys for stm32mp157a-dk1-u-boot

Instead of using "st,fastboot-gpios" and "st,stm32prog-gpios", declare
2 gpio-keys.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
1 file changed