smt32f746g: 6.1.x works, too

target/linux/Config.in.kernelversion

@@ -22,7 +22,6 @@ 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_10 if ADK_TARGET_SYSTEM_NUMATO_MIMASV2
 default ADK_TARGET_LINUX_KERNEL_VERSION_5_15 if ADK_TARGET_ARCH_NDS32
-default ADK_TARGET_LINUX_KERNEL_VERSION_5_15 if ADK_TARGET_SYSTEM_ST_STM32F746G
 default ADK_TARGET_LINUX_KERNEL_VERSION_6_1
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_GIT