u-boot-librem5: upgrade to 0.6 (MR 1231)

This upgrades the u-boot and ATF in this package to the latest from
Purism's repos.

temp/u-boot-librem5/APKBUILD

 # Forked from Alpine, so we can build it with Librem 5 phone support
 pkgname=u-boot-librem5
-pkgver=0.5
+pkgver=0.6
 pkgrel=0
-# 'librem5' branch for devkit
-_atfversion="783fc2b2c4266bfdb5218e4d9b6b2bc90849e0e9"
-# 'busfreq' branch
-_ubootversion="2270b6cd3c143350d4fc9fe0e0d24ca209463bf2"
+# 'librem5' branch in atf repo
+_atfversion="92c2de12d36b31938ce940d5cac3c30a98665237"
+# 'librem5' branch in uboot repo
+_ubootversion="586f40403aa6baf6cba8181b871313d6c696edd3"
 _m4version="a017421c340a69f2392086da93841244f78a03c5"
 _firmwareversion="7.9"
 pkgdesc="u-boot bootloader for the Purism Librem5 phone"
@@ -85,7 +85,7 @@ package() {
 }
 
 
-sha512sums="ea2ba344ead3407903618f361a14fe7561abac9c3d9849d9de8d197fca68992a5b338ee1875a17b1f37a80ff90763d066ecf29f101f7a7d2c09da3e6fa4e73f6  uboot-imx-2270b6cd3c143350d4fc9fe0e0d24ca209463bf2.tar.gz
+sha512sums="9a9fe715e8f78891b19256a42ae5fa4c2f3b6489a5d6ab0a780e600dd660cedaef5090555594a7d4c6163ff1ce1a107bf53c459a24742a5d1f2e5e84750b9f11  uboot-imx-586f40403aa6baf6cba8181b871313d6c696edd3.tar.gz
 035a4358ddf586c829da7fa2fb0d9d1df913c0c454f2d0e57ff0c6794552e49950fb6373f9aaf72e0e4c78ab411496aabbc60bf66cd76e35053f7a2d77911735  m4-a017421c340a69f2392086da93841244f78a03c5.tar.gz
-d4366a775a6dbeab491087991238c55812371aa2d57279d01c49f0da2f0cfa60f6531609e53b79fb44c39b0e94fd5a2ddd2b13d77469d5588452f11de05ba40b  arm-trusted-firmware-783fc2b2c4266bfdb5218e4d9b6b2bc90849e0e9.tar.gz
+cd8c9411ae0e57d2c8c700bf3e8c8d03e7dab955ace249a00911dd8c42b42929e0de3a5885eb9b1d945174abc8cfb177595d83c235e757c70640f451b62547ba  arm-trusted-firmware-92c2de12d36b31938ce940d5cac3c30a98665237.tar.gz
 d7c221e0c1cc5a22c9b98ba369f481d690a2227b0897836fb0b18975f0d2f0a085f7a120d24bdd161850d32f878e7f1aa47015dee76f7b40e84f45adf379e22c  firmware-imx-7.9.bin"