mpc83xx: Get rid of CONFIG_SYS_LBC_*

Except for one counter example, CONFIG_SYS_LBC_LBCR always has a value
of either 0x00040000 or 0x00000000.

CONFIG_SYS_LBC_MRTPR always has the value 0x20000000.

CONFIG_SYS_LBC_LSDMR_{1,2,4,5} are not set for any mpc83xx board.

CONFIG_SYS_LBC_LSRT is set by one board (to 0x32000000).

To simplify the configuration files, hardcode the setting of these
values for mpc83xx.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/board/freescale/mpc8313erdb/sdram.c b/board/freescale/mpc8313erdb/sdram.c
index 090412d..c8e30a0 100644
--- a/board/freescale/mpc8313erdb/sdram.c
+++ b/board/freescale/mpc8313erdb/sdram.c
@@ -109,8 +109,9 @@
 	msize = fixed_sdram();
 
 	/* Local Bus setup lbcr and mrtpr */
-	lbc->lbcr = CONFIG_SYS_LBC_LBCR;
-	lbc->mrtpr = CONFIG_SYS_LBC_MRTPR;
+	lbc->lbcr = (0x00040000 | (0xFF << LBCR_BMT_SHIFT) | 0xF);
+	/* LB refresh timer prescal, 266MHz/32 */
+	lbc->mrtpr = 0x20000000;
 	sync();
 
 #ifndef CONFIG_SYS_8313ERDB_BROKEN_PMC