c-sky: do not depend on endian symbol

target/config/Config.in.cpu

@@ -437,7 +437,6 @@ config ADK_TARGET_CPU_CSKY_CK610
 	select ADK_TARGET_SUPPORTS_NPTL
 	select ADK_TARGET_WITH_MMU
 	depends on ADK_TARGET_ARCH_CSKY
-	depends on ADK_TARGET_LITTLE_ENDIAN
 
 config ADK_TARGET_CPU_CSKY_CK807
 	bool "ck807"
@@ -446,7 +445,6 @@ config ADK_TARGET_CPU_CSKY_CK807
 	select ADK_TARGET_SUPPORTS_NPTL
 	select ADK_TARGET_WITH_MMU
 	depends on ADK_TARGET_ARCH_CSKY
-	depends on ADK_TARGET_LITTLE_ENDIAN
 
 config ADK_TARGET_CPU_CSKY_CK810
 	bool "ck810"
@@ -455,7 +453,6 @@ config ADK_TARGET_CPU_CSKY_CK810
 	select ADK_TARGET_SUPPORTS_NPTL
 	select ADK_TARGET_WITH_MMU
 	depends on ADK_TARGET_ARCH_CSKY
-	depends on ADK_TARGET_LITTLE_ENDIAN
 
 # epiphany
 config ADK_TARGET_CPU_EPIPHANY