ARM64: Introduce arch_read_hardware_id

Moving towards device tree and arm single binary referring to
machine descriptor name for hardware id information under
/proc/cpuinfo is not suitable for certain soc vendors. Add a
hook for soc vendors to supply a per-soc hardware read method.

[abhimany: resolved minor merge conflicts]
Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>

Conflicts:
	arch/arm64/kernel/setup.c

Change-Id: I6c38a0c0dbf93acec6f6f67498c01c046a13e506

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index a446dd967e7c..99553b164f25 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -70,6 +70,9 @@ EXPORT_SYMBOL(boot_reason);
 unsigned int cold_boot;
 EXPORT_SYMBOL(cold_boot);
 
+char* (*arch_read_hardware_id)(void);
+EXPORT_SYMBOL(arch_read_hardware_id);
+
 static const char *machine_name;
 phys_addr_t __fdt_pointer __initdata;