arrow-db410c: also include DTB in "second" part of boot image (MR 2297)

I sometimes test DB410c via mainline U-Boot, which wants to have the
DTB in the "second" part of the Android boot image. Otherwise it works
fine. Include it there additionally to simplify this.

[ci:skip-build] already built successfully in CI

device/community/device-arrow-db410c/APKBUILD

@@ -3,7 +3,7 @@
 pkgname=device-arrow-db410c
 pkgdesc="Arrow DragonBoard 410c"
 pkgver=1
-pkgrel=1
+pkgrel=2
 url="https://postmarketos.org"
 license="MIT"
 arch="aarch64"
@@ -27,4 +27,6 @@ nonfree_firmware() {
 	mkdir "$subpkgdir"
 }
 
-sha512sums="6f1d55b39c3cc058088cadd80d212722442d879a90ddcf0f36f01eaaadc5cdc4164a5b73a589b646ab2133c13a4b80e953d6972195a6030153f7f0c4fc835494  deviceinfo"
+sha512sums="
+7cd887f02abf9a0275bf547b50e9143a7b753f39c2b04cbe553a4ee0d26533a9c733c0a9f2fce92d4603046c75a08b8831cd70f218882e5987fe978a94ecc510  deviceinfo
+"

device/community/device-arrow-db410c/deviceinfo

@@ -23,6 +23,7 @@ deviceinfo_getty="ttyMSM0;115200"
 deviceinfo_flash_method="fastboot"
 deviceinfo_kernel_cmdline="earlycon console=ttyMSM0,115200 PMOS_NO_OUTPUT_REDIRECT"
 deviceinfo_generate_bootimg="true"
+deviceinfo_bootimg_dtb_second="true"
 deviceinfo_flash_offset_base="0x80000000"
 deviceinfo_flash_offset_kernel="0x00080000"
 deviceinfo_flash_offset_ramdisk="0x02000000"