add more toolchaind escriptions

target/mips/sys-available/toolchain-mips64eln32

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+config ADK_TARGET_SYSTEM_TOOLCHAIN_MIPS64ELN32
+	bool "Toolchain only (mips64 little endian n32 ABI)"
+	select ADK_mips
+	select ADK_little
+	select ADK_n32
+	select ADK_toolchain_mips64el
+	select ADK_CPU_MIPS64
+	select ADK_LINUX_64
+	select ADK_TOOLCHAIN
+	select ADK_TARGET_PACKAGE_TGZ
+	help
+	  MIPS64 little endian n32 ABI toolchain.

target/mips/sys-available/toolchain-mips64eln64

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+config ADK_TARGET_SYSTEM_TOOLCHAIN_MIPS64ELN64
+	bool "Toolchain only (mips64 little endian n64 ABI)"
+	select ADK_mips
+	select ADK_little
+	select ADK_n64
+	select ADK_toolchain_mips64el
+	select ADK_CPU_MIPS64
+	select ADK_LINUX_64
+	select ADK_TOOLCHAIN
+	select ADK_TARGET_PACKAGE_TGZ
+	help
+	  MIPS64 little endian n64 ABI toolchain.

target/mips/sys-available/toolchain-mips64n32

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+config ADK_TARGET_SYSTEM_TOOLCHAIN_MIPS64N32
+	bool "Toolchain only (mips64 big endian n32 ABI)"
+	select ADK_mips
+	select ADK_big
+	select ADK_n32
+	select ADK_toolchain_mips64
+	select ADK_CPU_MIPS64
+	select ADK_LINUX_64
+	select ADK_TOOLCHAIN
+	select ADK_TARGET_PACKAGE_TGZ
+	help
+	  MIPS64 big endian n64 ABI toolchain.

target/mips/sys-available/toolchain-mips64n64

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+config ADK_TARGET_SYSTEM_TOOLCHAIN_MIPS64N64
+	bool "Toolchain only (mips64 big endian n64 ABI)"
+	select ADK_mips
+	select ADK_big
+	select ADK_n64
+	select ADK_toolchain_mips64
+	select ADK_CPU_MIPS64
+	select ADK_LINUX_64
+	select ADK_TOOLCHAIN
+	select ADK_TARGET_PACKAGE_TGZ
+	help
+	  MIPS64 big endian n64 ABI toolchain.