package/linux-headers: drop 6.11.x option

The 6.11.x series is now EOL upstream, so drop the linux-headers
option and add legacy handling for it.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>

Config.in.legacy

@@ -146,6 +146,13 @@ endif
 
 comment "Legacy options removed in 2025.02"
 
+config BR2_KERNEL_HEADERS_6_11
+	bool "kernel headers version 6.11.x are no longer supported"
+	select BR2_LEGACY
+	help
+	  Version 6.11.x of the Linux kernel headers are no longer
+	  maintained upstream and are now removed.
+
 config BR2_PACKAGE_GIBLIB
 	bool "giblib has been removed"
 	select BR2_LEGACY

linux/linux.hash

@@ -1,6 +1,5 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
 sha256  c89809cc777d50f1ea484a118630281a26383707a0e752c96fd834f6e765deae  linux-6.12.3.tar.xz
-sha256  62148e7e17f54c4a5ab5e75ad4882682c54bee818948be61a5963234fc0849fc  linux-6.11.11.tar.xz
 sha256  d1054ab4803413efe2850f50f1a84349c091631ec50a1cf9e891d1b1f9061835  linux-6.6.63.tar.xz
 sha256  aecdaf39d0a844a81ce4c67d9daff8979e938bb690df4f679fbbb494fe423278  linux-6.1.119.tar.xz
 # From https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc

package/linux-headers/Config.in.host

@@ -48,10 +48,6 @@ config BR2_KERNEL_HEADERS_6_6
 	bool "Linux 6.6.x kernel headers"
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_6
 
-config BR2_KERNEL_HEADERS_6_11
-	bool "Linux 6.11.x kernel headers"
-	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_11
-
 config BR2_KERNEL_HEADERS_6_12
 	bool "Linux 6.12.x kernel headers"
 	select BR2_TOOLCHAIN_HEADERS_AT_LEAST_6_12
@@ -442,7 +438,6 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "5.15.173"	if BR2_KERNEL_HEADERS_5_15
 	default "6.1.119"	if BR2_KERNEL_HEADERS_6_1
 	default "6.6.63"	if BR2_KERNEL_HEADERS_6_6
-	default "6.11.11"	if BR2_KERNEL_HEADERS_6_11
 	default "6.12.3"	if BR2_KERNEL_HEADERS_6_12
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
 	default "custom"	if BR2_KERNEL_HEADERS_CUSTOM_TARBALL