arm64: Add support for Spreadtrum's Sharkl64 Platform in Kconfig and defconfig

Adds support for Spreadtrum's SoC Platform in the arm64 Kconfig and
defconfig files.

Signed-off-by: Zhizhou Zhang <zhizhou.zhang@spreadtrum.com>
Signed-off-by: Orson Zhai <orson.zhai@spreadtrum.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 9f805cf..56f425b 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -208,6 +208,11 @@
 	  but contains an NVIDIA Denver CPU complex in place of
 	  Tegra124's "4+1" Cortex-A15 CPU complex.
 
+config ARCH_SPRD
+	bool "Spreadtrum SoC platform"
+	help
+	  Support for Spreadtrum ARM based SoCs
+
 config ARCH_THUNDER
 	bool "Cavium Inc. Thunder SoC Family"
 	help