Add a directory by kernel instead of a common root, add qnap-301w and rpi4 kernel 6.1 suppport

6.1/target/linux/bcm27xx/patches-6.1/0306-vc-sm-cma-fixed-kbuild-problem.patch

@@ -0,0 +1,35 @@
+From be8bb1949cfdd0ee3ee0f1641aec63557ea74322 Mon Sep 17 00:00:00 2001
+From: gesangtome <gesangtome@foxmail.com>
+Date: Fri, 1 Jan 2021 18:03:17 +0800
+Subject: [PATCH 306/726] vc-sm-cma: fixed kbuild problem
+
+error logs:
+  drivers/staging/vc04_services/vc-sm-cma/Kconfig:1:error: recursive dependency detected!
+  drivers/staging/vc04_services/vc-sm-cma/Kconfig:1:      symbol BCM_VC_SM_CMA is selected by BCM2835_VCHIQ_MMAL
+  drivers/staging/vc04_services/vchiq-mmal/Kconfig:1:     symbol BCM2835_VCHIQ_MMAL depends on BCM2835_VCHIQ
+  drivers/staging/vc04_services/Kconfig:14:       symbol BCM2835_VCHIQ is selected by BCM_VC_SM_CMA
+  For a resolution refer to Documentation/kbuild/kconfig-language.rst
+  subsection "Kconfig recursive dependency limitations"
+
+Tested-by: make ARCH=arm64 bcm2711_defconfig
+Test platform: fedora 33
+Branch: rpi-5.10.y
+---
+ drivers/staging/vc04_services/vchiq-mmal/Kconfig | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/staging/vc04_services/vchiq-mmal/Kconfig b/drivers/staging/vc04_services/vchiq-mmal/Kconfig
+index a7c1a7bf516e..5df9198cdab1 100644
+--- a/drivers/staging/vc04_services/vchiq-mmal/Kconfig
++++ b/drivers/staging/vc04_services/vchiq-mmal/Kconfig
+@@ -1,6 +1,6 @@
+ config BCM2835_VCHIQ_MMAL
+ 	tristate "BCM2835 MMAL VCHIQ service"
+-	depends on BCM2835_VCHIQ
++	select BCM2835_VCHIQ
+ 	select BCM_VC_SM_CMA
+ 	help
+ 	  Enables the MMAL API over VCHIQ interface as used for the
+-- 
+2.33.1
+