sparc: we need at least 4.2.x, 4.1 is broken

target/config/Config.in.kernelversion

@@ -6,6 +6,7 @@ prompt "Kernel Version"
 depends on ADK_TARGET_KERNEL_CUSTOMISING
 default ADK_TARGET_KERNEL_VERSION_4_2_5 if ADK_TARGET_ARCH_ARC
 default ADK_TARGET_KERNEL_VERSION_4_2_5 if ADK_TARGET_ARCH_H8300
+default ADK_TARGET_KERNEL_VERSION_4_2_5 if ADK_TARGET_ARCH_SPARC
 default ADK_TARGET_KERNEL_VERSION_4_1_10
 
 config ADK_TARGET_KERNEL_VERSION_GIT
@@ -19,6 +20,7 @@ config ADK_TARGET_KERNEL_VERSION_4_1_10
 	bool "4.1.10"
 	depends on !ADK_TARGET_ARCH_ARC
 	depends on !ADK_TARGET_ARCH_H8300
+	depends on !ADK_TARGET_ARCH_SPARC
 	depends on !ADK_TARGET_SYSTEM_KINETIS_K70
 	select ADK_TARGET_KERNEL_VERSION_4_1