board/pine64/pinecube: new board

Add support for PineCube with:
- U-Boot 2022.04
- Linux 5.15.61

PineCube is a low-powered, open source IP camera
with the following specs:
 - Allwinner S3 Cortex-A7
 - 128 MiB DDR3
 - 16 MiB SPI flash
 - 5 MPx OV5640 camera
 - MicroSD slot
 - 10/100M Ethernet with passive PoE
 - 802.11 b/g/n WiFi
 - Bluetooth 4.1
 - USB 2.0
 - 26 pins GPIO header
 - Microphone
 - IR LEDs for night vision

Board homepage: https://www.pine64.org/cube/
Board wiki:     https://wiki.pine64.org/wiki/PineCube

Signed-off-by: Jan Havran <havran.jan@email.cz>
Reviewed-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/pine64_pinecube_defconfig

@@ -0,0 +1,45 @@
+# Target options
+BR2_arm=y
+BR2_cortex_a7=y
+BR2_ARM_FPU_VFPV4=y
+
+# Toolchain options
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_15=y
+
+# System configuration
+BR2_TARGET_GENERIC_HOSTNAME="pinecube"
+BR2_TARGET_GENERIC_ISSUE="Welcome to Pine64 Pinecube"
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/pine64/pinecube/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/pine64/pinecube/genimage.cfg"
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.15.61"
+BR2_LINUX_KERNEL_DEFCONFIG="sunxi"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="sun8i-s3-pinecube"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+
+# Filesystem
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+
+# Bootloader
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2022.04"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="pinecube"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
+BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
+BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
+BR2_TARGET_UBOOT_SPL=y
+BR2_TARGET_UBOOT_SPL_NAME="u-boot-sunxi-with-spl.bin"
+
+# Required host utilities for building an SDCard image
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y