Stop passing around bootmem_base value.

For the calls to boot_relocate_fdt(), boot_get_cmdline(), and
boot_get_kbd(), the value of bootmem_base is always obtained by
calling getenv_bootm_low().  Since the value always comes from the
same source, the calling signature for those functions can be
simplified by making them call getenv_bootm_low() directly.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
diff --git a/arch/powerpc/lib/bootm.c b/arch/powerpc/lib/bootm.c
index c7f3d08..6e2a81b 100644
--- a/arch/powerpc/lib/bootm.c
+++ b/arch/powerpc/lib/bootm.c
@@ -186,7 +186,6 @@
 
 static int boot_cmdline_linux(bootm_headers_t *images)
 {
-	ulong bootmap_base = getenv_bootm_low();
 	ulong of_size = images->ft_len;
 	struct lmb *lmb = &images->lmb;
 	ulong *cmd_start = &images->cmdline_start;
@@ -196,7 +195,7 @@
 
 	if (!of_size) {
 		/* allocate space and init command line */
-		ret = boot_get_cmdline (lmb, cmd_start, cmd_end, bootmap_base);
+		ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 		if (ret) {
 			puts("ERROR with allocation of cmdline\n");
 			return ret;
@@ -208,7 +207,6 @@
 
 static int boot_bd_t_linux(bootm_headers_t *images)
 {
-	ulong bootmap_base = getenv_bootm_low();
 	ulong of_size = images->ft_len;
 	struct lmb *lmb = &images->lmb;
 	bd_t **kbd = &images->kbd;
@@ -217,7 +215,7 @@
 
 	if (!of_size) {
 		/* allocate space for kernel copy of board info */
-		ret = boot_get_kbd (lmb, kbd, bootmap_base);
+		ret = boot_get_kbd (lmb, kbd);
 		if (ret) {
 			puts("ERROR with allocation of kernel bd\n");
 			return ret;
@@ -235,7 +233,6 @@
 	ulong *initrd_start = &images->initrd_start;
 	ulong *initrd_end = &images->initrd_end;
 #if defined(CONFIG_OF_LIBFDT)
-	ulong bootmap_base = getenv_bootm_low();
 	ulong of_size = images->ft_len;
 	char **of_flat_tree = &images->ft_addr;
 #endif
@@ -258,7 +255,7 @@
 		return ret;
 
 #if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_SYS_BOOTMAPSZ)
-	ret = boot_relocate_fdt(lmb, bootmap_base, of_flat_tree, &of_size);
+	ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size);
 	if (ret)
 		return ret;