configs/rock5b: build and install rock5b device tree overlays

Build and install all in-tree rock5b device tree overlays.

The device tree overlays will be available in /boot, such that it is
possible for u-boot to apply one (or many) of them before booting Linux.

Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>

configs/rock5b_defconfig

@@ -17,6 +17,7 @@ BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/radxa/rock5b/linux.fragment"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="rockchip/rk3588-rock-5b"
+BR2_LINUX_KERNEL_INTREE_DTSO_NAMES="rockchip/rk3588-rock-5b-pcie-srns rockchip/rk3588-rock-5b-pcie-ep"
 BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT=y
 BR2_LINUX_KERNEL_INSTALL_TARGET=y
 BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y