default.xml: Bump meta-raspberrypi layer to fix unknown kernel git revision

The Raspberry Pi upstream kernel tree has been rebased and the git
revision referenced to fetch has disappeared. After the update in
meta-raspberrypi to a working revision we can now bump and fix fetch
problems in Oniro.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

manifests/default.xml

@@ -30,7 +30,7 @@ SPDX-FileCopyrightText: Huawei Inc.
 	<project name="pub/intel/yocto/meta-seco-intel" remote="seco" revision="65a673560211b11986db5785c70254fad190785f" path="meta-seco-intel" />
 	<project name="meta-freescale" remote="yocto" revision="04a7bbdddfe9cfd41e93f127fed41293cde79741" path="meta-freescale" />
 	<project name="pub/i.mx/yocto/5.x/meta-seco-imx" remote="seco" revision="ef8748bbe79817f53153e813acae6ea006775b59" path="meta-seco-imx" />
-	<project name="meta-raspberrypi" remote="yocto" revision="0637a85eddc8e87a1a20cce1cd8a51f9f0f5f354" path="meta-raspberrypi" />
+	<project name="meta-raspberrypi" remote="yocto" revision="7a9b2751f0c0822af1e18536a33358002b99cb05" path="meta-raspberrypi" />
 	<project name="meta-security" remote="yocto" revision="6cc8dde794bd56077e0e2eb5d303e958cc553b68" path="meta-security" />
 	<project name="rauc/meta-rauc" remote="github" revision="9e206d6998b363315791be144815a4eabc3fe5a8" path="meta-rauc" />
 	<project name="riscv/meta-riscv" remote="github" revision="b3550462b3e827259efbc8872ead6ecc0e30c7fb" path="meta-riscv" />