EDAC/thunderx: Make symbol lmc_dfs_ents static

Symbol 'lmc_dfs_ents' is not used outside of thunderx_edac.c, so
make it static:

drivers/edac/thunderx_edac.c:457:22: warning:
symbol 'lmc_dfs_ents' was not declared. Should it be static?

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Wei Yongjun <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Acked-by: Robert Richter <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]

drivers/edac/thunderx_edac.c

···
 DEBUGFS_STRUCT(inject_ecc, 0200, thunderx_lmc_inject_ecc_write, NULL);
 DEBUGFS_STRUCT(int_w1c, 0400, NULL, thunderx_lmc_int_read);
 
-struct debugfs_entry *lmc_dfs_ents[] = {
+static struct debugfs_entry *lmc_dfs_ents[] = {
 	&debugfs_mask0,
 	&debugfs_mask2,
 	&debugfs_parity_test,