ArmPlatformPkg: Fix for boot hung with aarch64 uefi and c64 arm-tf

Signed-off-by: Prabin CA <prabin.ca@arm.com>
Change-Id: I6c2525c6e8f840d4833456f3c3d866213c27a1eb
2 jobs for !5 with patch-211851 in 2 minutes and 44 seconds (queued for 3 seconds)
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build-edk2

00:02:29

passed #66288
build-grub

00:02:44