[Buildroot] [git commit branch/next] board/raspberrypi: add rpi4 64 bit hint

[Yann E. MORIN]

commit: https://git.buildroot.net/buildroot/commit/?id=24c0306feb0ab0b860060025ba89cc39d05a1e03
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/next

Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
---
 board/raspberrypi/readme.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/board/raspberrypi/readme.txt b/board/raspberrypi/readme.txt
index ac784e07fd..2a876f9ae4 100644
--- a/board/raspberrypi/readme.txt
+++ b/board/raspberrypi/readme.txt
@@ -43,6 +43,10 @@ For model 4 B:
 
   $ make raspberrypi4_defconfig
 
+or for model 4 B (64 bit):
+
+  $ make raspberrypi4_64_defconfig
+
 Build the rootfs
 ----------------