vppinfra: remove linux/syscall.h

For portabiliy reasons it is better to have all wrapped in clib code.
I.e. instead of using getcpu() we have clib_get_current_numa_node () and
clib_get_current_cpu_id().

Type: refactor
Change-Id: I29b52d7f29bc7f93873402c4070561f564b71c63
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vppinfra/cpu.h b/src/vppinfra/cpu.h
index bc4ee58..6925d58 100644
--- a/src/vppinfra/cpu.h
+++ b/src/vppinfra/cpu.h
@@ -167,21 +167,8 @@
 _ (sha512,     21) \
 _ (sve,        22)
 
-static inline u32
-clib_get_current_cpu_id ()
-{
-  unsigned cpu, node;
-  syscall (__NR_getcpu, &cpu, &node, 0);
-  return cpu;
-}
-
-static inline u32
-clib_get_current_numa_node ()
-{
-  unsigned cpu, node;
-  syscall (__NR_getcpu, &cpu, &node, 0);
-  return node;
-}
+u32 clib_get_current_cpu_id ();
+u32 clib_get_current_numa_node ();
 
 #if defined(__x86_64__)
 #include "cpuid.h"