configs: stm32mp: Enable UNZIP on STMicroelectronics stm32mp15 boards

The CMD_UNZIP provides the 'gzwrite' command, which is convenient
for writing e.g. gz-compressed images to eMMC from U-Boot.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/configs/stm32mp15_trusted_defconfig b/configs/stm32mp15_trusted_defconfig
index d5fc4d0..afbf721 100644
--- a/configs/stm32mp15_trusted_defconfig
+++ b/configs/stm32mp15_trusted_defconfig
@@ -21,6 +21,7 @@
 CONFIG_CMD_NVEDIT_EFI=y
 CONFIG_CMD_MEMINFO=y
 CONFIG_CMD_MEMTEST=y
+CONFIG_CMD_UNZIP=y
 CONFIG_CMD_ADC=y
 CONFIG_CMD_CLK=y
 CONFIG_CMD_DFU=y