arm64: zynqmp: Make chip_id a global routine()

This patch makes chip_id() as a global routine so that
it can be used in other places as required.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/include/asm/arch-zynqmp/sys_proto.h

@@ -45,4 +45,6 @@ int invoke_smc(u32 pm_api_id, u32 arg0, u32 arg1, u32 arg2, u32 arg3,
 
 void initialize_tcm(bool mode);
 
+int chip_id(unsigned char id);
+
 #endif /* _ASM_ARCH_SYS_PROTO_H */

board/xilinx/zynqmp/zynqmp.c

@@ -76,7 +76,7 @@ static const struct {
 	},
 };
 
-static int chip_id(unsigned char id)
+int chip_id(unsigned char id)
 {
 	struct pt_regs regs;
 	regs.regs[0] = ZYNQMP_SIP_SVC_CSU_DMA_CHIPID;