arm/boot-wrapper-aarch64: use https to fetch git source

Some networks limit outgoing git: traffic, so use https:.

Fixes: 0cec3e5 ("arm/gem5/boot-wrapper-aarch64: Move main recipe to meta-arm")
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm/recipes-bsp/boot-wrapper-aarch64/boot-wrapper-aarch64_git.bb

@@ -3,7 +3,7 @@ LICENSE = "BSD-3-Clause"
 
 LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=bb63326febfb5fb909226c8e7ebcef5c"
 
-SRC_URI = "git://git.kernel.org/pub/scm/linux/kernel/git/mark/boot-wrapper-aarch64.git;branch=master"
+SRC_URI = "git://git.kernel.org/pub/scm/linux/kernel/git/mark/boot-wrapper-aarch64.git;branch=master;protocol=https"
 SRCREV = "1044c77062573985f7c994c3b6cef5695f57e955"
 
 PV = "git${SRCPV}"