treewide: Make remaining source files non-executable

.c and .h source files should not be executable, change
the permissions to 0644.

[ This would normally go through Andrew Morton, but his ancient
  patch-based toolchain doesn't do permission changes ]

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/gpu/drm/amd/include/asic_reg/dce/dce_11_2_d.h b/drivers/gpu/drm/amd/include/asic_reg/dce/dce_11_2_d.h
old mode 100755
new mode 100644
diff --git a/drivers/gpu/drm/amd/include/asic_reg/dce/dce_11_2_sh_mask.h b/drivers/gpu/drm/amd/include/asic_reg/dce/dce_11_2_sh_mask.h
old mode 100755
new mode 100644
diff --git a/drivers/gpu/drm/amd/include/cgs_common.h b/drivers/gpu/drm/amd/include/cgs_common.h
old mode 100755
new mode 100644
diff --git a/drivers/gpu/drm/amd/powerplay/smumgr/fiji_smumgr.c b/drivers/gpu/drm/amd/powerplay/smumgr/fiji_smumgr.c
old mode 100755
new mode 100644
diff --git a/scripts/sign-file.c b/scripts/sign-file.c
old mode 100755
new mode 100644