ARM: prima2: common: fix checkpatch issues

fix the below checkpatch issues:
ERROR: Use of const init definition must use __initconst
30: FILE: common.c:30:
+static const char *atlas6_dt_match[] __initdata = {

ERROR: Use of const init definition must use __initconst
45: FILE: common.c:45:
+static const char *prima2_dt_match[] __initdata = {

ERROR: Use of const init definition must use __initconst
61: FILE: common.c:61:
+static const char *marco_dt_match[] __initdata = {

Signed-off-by: Barry Song <Baohua.Song@csr.com>