device-pine64-rockpro64: update u-boot image name (MR 4473)

Adjust to change in Alpine that moved rockchip to single image:
https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/51827

Fix for:
  ERROR: The following firmware binary does not exist in the rootfs_pine64-rockpro64 chroot: /usr/share/u-boot/rockpro64-rk3399/idbloader.img
[ci:skip-build]: already built successfully in CI

device/community/device-pine64-rockpro64/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Bart Ribbers <bribbers@disroot.org>
 pkgname=device-pine64-rockpro64
 pkgver=3
-pkgrel=5
+pkgrel=6
 pkgdesc="PINE64 ROCKPro64"
 url="https://postmarketos.org"
 license="MIT"
@@ -28,5 +28,5 @@ nonfree_firmware() {
 }
 
 sha512sums="
-eda78fea2ccd53b2edb3895919ecaa6831c815509d2324bca8e23a6c901100215f4df5b63aa1a8e0a47a879af258c86cd84f661042088b67b5de566a49afc4a8  deviceinfo
+75388e8dd877db42b5ffa7148e667487f58785ef1112dda3dd5e34122f24870887de4e38aa9a861ac454e6eaa6b3a3b91583e92548b349c2e7919408565e4a65  deviceinfo
 "

device/community/device-pine64-rockpro64/deviceinfo

@@ -19,7 +19,7 @@ deviceinfo_screen_height="1080"
 
 # Bootloader related
 deviceinfo_flash_method="none"
-deviceinfo_sd_embed_firmware="u-boot/rockpro64-rk3399/idbloader.img:32,u-boot/rockpro64-rk3399/u-boot.itb:8192"
+deviceinfo_sd_embed_firmware="u-boot/rockpro64-rk3399/u-boot-rockchip.bin:32"
 deviceinfo_boot_part_start="32768"
 deviceinfo_kernel_cmdline="console=tty0 console=ttyS2,1500000n8 panic=10 coherent_pool=1M video=HDMI-A-1:1920x1080@60 video=eDP-1:1920x1080@60 loglevel=5 PMOS_NO_OUTPUT_REDIRECT"
 deviceinfo_generate_extlinux_config="true"