bcm28xx: update kernel to 6.18.18

target/linux/Config.in.kernelversion

@@ -277,7 +277,7 @@ config ADK_TARGET_LINUX_KERNEL_GIT
 	default "f6e9dab9d1dc1e8fa2acb75504bf5ff86b885b8e" if ADK_TARGET_CPU_ARC_ARC32 || ADK_TARGET_CPU_ARC_ARC64
 	default "b02c139d3608c8ae87f5398a3a29854f6df7a041" if ADK_TARGET_ARCH_KVX
 	default "6a2f2e4198eaff63ee75f6085ce9f966c47b4441" if ADK_TARGET_ARCH_LM32
-	default "0c7075b4607f90c2fecf5e290e91168a91567d70" if ADK_TARGET_BOARD_BCM28XX
+	default "4ff1cf7e9c8a1068c7501c712edf10550f66865f" if ADK_TARGET_BOARD_BCM28XX
 	default "f8d3b2a0fa5054aaed0f14cd457db9d8922bb167" if ADK_TARGET_SYSTEM_ADSP_BF537
 	default "e7c8afc1dda7b7c18596d90ad6a17ae886650b72" if ADK_TARGET_SYSTEM_KINETIS_K70
 	default "v4.4.52-phy" if ADK_TARGET_SYSTEM_PHYTEC_WEGA
@@ -285,7 +285,7 @@ config ADK_TARGET_LINUX_KERNEL_GIT
 config ADK_TARGET_LINUX_KERNEL_GIT_VER
 	string "kernel version"
 	depends on ADK_TARGET_LINUX_KERNEL_VERSION_GIT
-	default "6.12.51" if ADK_TARGET_BOARD_BCM28XX
+	default "6.18.18" if ADK_TARGET_BOARD_BCM28XX
 	default "5.16" if ADK_TARGET_CPU_ARC_ARC32 || ADK_TARGET_CPU_ARC_ARC64
 	default "4.4.52" if ADK_TARGET_SYSTEM_PHYTEC_WEGA
 	default "2.6.33" if ADK_TARGET_SYSTEM_KINETIS_K70