configs/pine64_sopine: Use mainline ATF

Use the mainline ATF as it supports the Pine64 SoPine module.

Fixes:
  https://gitlab.com/buildroot.org/buildroot/-/jobs/2812053812

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 3d5ba95da6084d5d6cadca06018925f2172453cf)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/pine64_sopine_defconfig

@@ -7,10 +7,9 @@ BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_0=y
 
 # Firmware
 BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
-BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_GIT=y
-BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_REPO_URL="https://github.com/apritzel/arm-trusted-firmware.git"
-BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="sun50iw1p1"
-BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_REPO_VERSION="aa75c8da415158a94b82a430b2b40000778e851f"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION_VALUE="v2.7"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="sun50i_a64"
 BR2_TARGET_ARM_TRUSTED_FIRMWARE_BL31=y
 
 # Bootloader