riscv: update kernel branch to 4.18

target/linux/Config.in.kernelversion

@@ -212,16 +212,16 @@ config ADK_TARGET_LINUX_KERNEL_GIT
 	default "902739f3353150ac9eb69ad995098f3079d862a3" if ADK_TARGET_SYSTEM_SOLIDRUN_CLEARFOG
 	default "c85fbc86c61a8c8fd45ab1fe3d1bdd2df12f7962" if ADK_TARGET_SYSTEM_SOLIDRUN_IMX6
 	default "8624998967676862843aed1f8ee2141e98987f81" if ADK_TARGET_SYSTEM_BEAGLEBONE_BLACK
-	default "riscv-linux-4.15" if ADK_TARGET_ARCH_RISCV32
-	default "riscv-linux-4.15" if ADK_TARGET_ARCH_RISCV64
+	default "riscv-linux-4.18" if ADK_TARGET_ARCH_RISCV32
+	default "riscv-linux-4.18" if ADK_TARGET_ARCH_RISCV64
 	default "v4.4.52-phy" if ADK_TARGET_SYSTEM_PHYTEC_WEGA
 
 config ADK_TARGET_LINUX_KERNEL_GIT_VER
 	string "kernel version"
 	depends on ADK_TARGET_LINUX_KERNEL_VERSION_GIT
 	default "4.9.56" if ADK_TARGET_ARCH_CSKY
-	default "4.15.0" if ADK_TARGET_ARCH_RISCV32
-	default "4.15.0" if ADK_TARGET_ARCH_RISCV64
+	default "4.18.0" if ADK_TARGET_ARCH_RISCV32
+	default "4.18.0" if ADK_TARGET_ARCH_RISCV64
 	default "4.14.43" if ADK_TARGET_BOARD_BCM28XX
 	default "4.4.37" if ADK_TARGET_SYSTEM_BEAGLEBONE_BLACK
 	default "4.4.52" if ADK_TARGET_SYSTEM_PHYTEC_WEGA