siteinfo-zephyr.bbclass: refactor siteinfo

Move all SITEINFO_EXTRA_DATAFUNCS and PACKAGEQA_EXTRA_MACHDEFFUNCS
from various tune files (tune-arc.inc, tune-iamcu.inc, tune-nios2.inc)
into a a new siteinfo-zephyr.bbclass file. Although the original code did
not result in any obvious errors, in fact it did cause some multiconfig
problems.

[YOCTO#11166]

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>

classes/siteinfo-zephyr.bbclass

@@ -0,0 +1,28 @@
+
+def arc_siteinfo_setfunc(archinfo, osinfo, targetinfo, d):
+    archinfo['arc'] = "endian-little bit-32 "
+    osinfo['linux'] = "common-linux common-glibc"
+    targetinfo['arc-linux'] = "arc-linux"
+    return archinfo, osinfo, targetinfo
+
+SITEINFO_EXTRA_DATAFUNCS += "arc_siteinfo_setfunc"
+
+def arc_machdata_setfunc(machdata, d):
+    machdata["elf"] = { "arc" : (195, 0, 0, True, 32), }
+    return machdata
+
+PACKAGEQA_EXTRA_MACHDEFFUNCS += "arc_machdata_setfunc"
+
+def iamcu_siteinfo_setfunc(archinfo, osinfo, targetinfo, d):
+    archinfo['iamcu'] = "endian-little bit-32 "
+    osinfo['linux'] = "common-linux common-glibc"
+    targetinfo['iamcu-linux'] = "iamcu-linux"
+    return archinfo, osinfo, targetinfo
+
+SITEINFO_EXTRA_DATAFUNCS += "iamcu_siteinfo_setfunc"
+
+def nios2_machdata_setfunc(machdata, d):
+    machdata["elf"] = {"nios2":  (113, 0, 0, True, 32), }
+    return machdata
+
+PACKAGEQA_EXTRA_MACHDEFFUNCS += "nios2_machdata_setfunc"