linux: update to 6.18.15, make default it is the new LTS

mk/linux-ver.mk

@@ -16,10 +16,10 @@ KERNEL_RELEASE:=	1
 KERNEL_VERSION:=	$(ADK_TARGET_LINUX_KERNEL_GIT_VER)-$(KERNEL_RELEASE)
 endif
 ifeq ($(ADK_TARGET_LINUX_KERNEL_VERSION_6_18),y)
-KERNEL_FILE_VER:=	6.18.13
+KERNEL_FILE_VER:=	6.18.15
 KERNEL_RELEASE:=	1
 KERNEL_VERSION:=	$(KERNEL_FILE_VER)-$(KERNEL_RELEASE)
-KERNEL_HASH:=		ed2c3c55fd38e6836c094fce356f2567f9516130b73354a29857960368c5687f
+KERNEL_HASH:=		7c716216c3c4134ed0de69195701e677577bbcdd3979f331c182acd06bf2f170
 endif
 ifeq ($(ADK_TARGET_LINUX_KERNEL_VERSION_6_12),y)
 KERNEL_FILE_VER:=	6.12.74

target/linux/Config.in.kernelversion

@@ -24,7 +24,7 @@ default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_SYSTEM_ST_STM32F769
 default ADK_TARGET_LINUX_KERNEL_VERSION_5_4 if ADK_TARGET_ARCH_C6X
 default ADK_TARGET_LINUX_KERNEL_VERSION_5_15 if ADK_TARGET_ARCH_NDS32
 default ADK_TARGET_LINUX_KERNEL_VERSION_6_6 if ADK_TARGET_ARCH_IA64
-default ADK_TARGET_LINUX_KERNEL_VERSION_6_12
+default ADK_TARGET_LINUX_KERNEL_VERSION_6_18
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_GIT
 	bool "git"
@@ -40,7 +40,7 @@ config ADK_TARGET_LINUX_KERNEL_VERSION_GIT
 	select ADK_HOST_NEED_LZ4 if ADK_TARGET_SYSTEM_PHYTEC_WEGA && ADK_TARGET_LINUX_KERNEL_VERSION_GIT
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_6_18
-	bool "6.18.13"
+	bool "6.18.15"
 	depends on !ADK_TARGET_ARCH_AVR32
 	depends on !ADK_TARGET_ARCH_BFIN
 	depends on !ADK_TARGET_ARCH_C6X