[MACHINE][C72 Mini] Add configuration for C72 Mini

conf/machine/seco-imx8mm-c72.conf

+#@TYPE: Machine
+#@NAME: SECO i.MX8MM uQ7 Module
+#@SOC: i.MX8MM
+#@DESCRIPTION: Machine configuration for SECO i.MX8MMini uQ7-C72
+#@MAINTAINER: Yuri Mazzuoli <yuri.mazzuoli@seco.com>
+
+require conf/machine/seco-c72.inc
+
+MACHINEOVERRIDES =. "mx8:mx8m:mx8mm:"
+
+UBOOT_DTB_NAME = "seco-imx8mm-c72.dtb"
+
+UBOOT_CONFIG[sd] = "seco_imx8mm_c72_defconfig,sdcard"
+
+IMX_BOOT_SEEK = "33"
+IMX_BOOT_SOC_TARGET = "iMX8MM"
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