feat(rpi): add Raspberry Pi 5 support

The Raspberry Pi 5 is a single-board computer based on BCM2712 that
contains four Arm Cortex-A76 cores.

This change introduces minimal BL31 support with PSCI that has been
validated to boot Linux and a private EDK2 build.

It's a drop-in replacement for the custom TF-A armstub now included in
the EEPROM images.

Change-Id: Id72a0370f54e71ac97c3daa1bacedacb7dec148f
Signed-off-by: Mario Bălănică <mariobalanica02@gmail.com>
diff --git a/changelog.yaml b/changelog.yaml
index 35ffaa8..5135d69 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -541,6 +541,9 @@
           - title: Raspberry Pi 4
             scope: rpi4
 
+          - title: Raspberry Pi 5
+            scope: rpi5
+
       - title: Renesas
         scope: renesas