use kernel 5.10 for ppc64

target/linux/Config.in.kernelversion

@@ -23,6 +23,7 @@ default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_CPU_ARM_CORTEX_A53
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_SYSTEM_ST_STM32F429
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_SYSTEM_ST_STM32F769
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_19 if ADK_TARGET_ARCH_ARC
+default ADK_TARGET_LINUX_KERNEL_VERSION_5_10 if ADK_TARGET_ARCH_PPC64
 default ADK_TARGET_LINUX_KERNEL_VERSION_5_4
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_GIT