sh: drop duplicate symbol export on dreamcast and sh7785lcr.

With board_pci_channels now being exported in a single place, update the
boards that duplicated the export.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/drivers/pci/ops-dreamcast.c

@@ -165,4 +165,3 @@ struct pci_channel board_pci_channels[] = {
 	  &gapspci_mem_resource, 0, 1 },
 	{ 0, }
 };
-EXPORT_SYMBOL(board_pci_channels);

arch/sh/drivers/pci/ops-sh7785lcr.c

@@ -44,7 +44,6 @@ struct pci_channel board_pci_channels[] = {
 	{ &sh4_pci_ops, &sh7785_io_resource, &sh7785_mem_resource, 0, 0xff },
 	{ NULL, NULL, NULL, 0, 0 },
 };
-EXPORT_SYMBOL(board_pci_channels);
 
 static struct sh4_pci_address_map sh7785_pci_map = {
 	.window0	= {