sun50i: add support for aarch64 sun50i SoC family

Follow the same approach as in 32-bit sunxi SoC families:
- create sunxi64.inc: umbrella description for aarch64 sunxi
  -- specify proper u-boot/spl image types
  -- specify proper kernel image type
  -- specify u-boot/kernel preferred providers
- create basic description of sun50i SoC family
  -- sun50i SoC family is based on armv8

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>

conf/machine/include/sun50i.inc

@@ -0,0 +1,4 @@
+require conf/machine/include/sunxi64.inc
+require conf/machine/include/arm/arch-armv8.inc
+
+SOC_FAMILY = "sun50i"

conf/machine/include/sunxi64.inc

@@ -0,0 +1,24 @@
+SOC_FAMILY ??= ""
+include conf/machine/include/soc-family.inc
+
+PREFERRED_PROVIDER_virtual/kernel ?= "linux-mainline"
+PREFERRED_PROVIDER_u-boot ?= "u-boot"
+PREFERRED_PROVIDER_virtual/bootloader ?= "u-boot"
+
+KERNEL_IMAGETYPE ?= "Image"
+
+IMAGE_CLASSES += "sdcard_image-sunxi"
+IMAGE_FSTYPES += "ext4 tar.gz sunxi-sdimg"
+
+MACHINE_EXTRA_RRECOMMENDS = "kernel-modules"
+
+UBOOT_LOCALVERSION = "-g${@d.getVar('SRCPV', True).partition('+')[2][0:7]}"
+
+UBOOT_ENTRYPOINT ?= "0x40008000"
+UBOOT_LOADADDRESS ?= "0x400080OB00"
+
+UBOOT_BINARY ?= "u-boot.itb"
+SPL_BINARY ?= "spl/sunxi-spl.bin"
+
+SERIAL_CONSOLE ?= "115200 ttyS0"
+MACHINE_FEATURES ?= "alsa apm keyboard rtc serial screen usbgadget usbhost vfat"