serial: Fix sparc driver name strings.
They were all "serial" so if multiple of these drivers registered,
we'd trigger sysfs directory creation errors:
[ 1.695793] proc_dir_entry 'serial' already registered
[ 1.695839] Call Trace:
[ 1.831891] [
00000000004f2534] create_proc_entry+0x7c/0x98
[ 1.833608] [
00000000004f3a58] proc_tty_register_driver+0x40/0x70
[ 1.833663] [
0000000000594700] tty_register_driver+0x1fc/0x208
[ 1.835371] [
00000000005aade4] uart_register_driver+0x134/0x16c
[ 1.841762] [
00000000005ac274] sunserial_register_minors+0x34/0x68
[ 1.841818] [
00000000007db2a4] sunsu_init+0xf8/0x150
[ 1.867697] [
00000000007c62a4] kernel_init+0x190/0x330
[ 1.939147] [
0000000000426cf8] kernel_thread+0x38/0x48
[ 1.939198] [
00000000006a0d90] rest_init+0x18/0x5c
Signed-off-by: David S. Miller <davem@davemloft.net>