arm: cortex-a53 defaults missing

target/config/Config.in.compiler

@@ -34,6 +34,7 @@ default ADK_TOOLCHAIN_GCC_AVR32 if ADK_TARGET_ARCH_AVR32
 default ADK_TOOLCHAIN_GCC_METAG if ADK_TARGET_ARCH_METAG
 default ADK_TOOLCHAIN_GCC_NDS32 if ADK_TARGET_ARCH_NDS32
 default ADK_TOOLCHAIN_GCC_7 if ADK_TARGET_CPU_ARM_ARM11MPCORE
+default ADK_TOOLCHAIN_GCC_7 if ADK_TARGET_CPU_ARM_CORTEX_A53
 default ADK_TOOLCHAIN_GCC_8
 
 config ADK_TOOLCHAIN_GCC_GIT

target/linux/Config.in.kernelversion

@@ -21,6 +21,7 @@ default ADK_TARGET_LINUX_KERNEL_VERSION_4_4 if ADK_TARGET_ARCH_METAG
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_ARCH_AVR32
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_ARCH_BFIN
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_CPU_ARM_ARM11MPCORE
+default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_CPU_ARM_CORTEX_A53
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_19
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_GIT