powerpc: spl: configure SYS_MALLOC_F_LEN independently for SPL and full U-Boot

Some platforms have very limited SRAM to run SPL code, so there may
not be the same amount space for a malloc pool before relocation in
the SPL stage as the normal U-Boot stage.

Make SPL and (the full) U-Boot stage use independent SYS_MALLOC_F_LEN,
so the size of pre-relocation malloc pool can be configured memory
space independently.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[fixed up commit-message:]
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/powerpc/cpu/mpc83xx/start.S

@@ -264,14 +264,14 @@ in_flash:
 	cmplw	r3, r4
 	bne	1b
 
-#ifdef CONFIG_SYS_MALLOC_F_LEN
+#if CONFIG_VAL(SYS_MALLOC_F_LEN)
 
-#if CONFIG_SYS_MALLOC_F_LEN + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE
-#error "CONFIG_SYS_MALLOC_F_LEN too large to fit into initial RAM."
+#if CONFIG_VAL(SYS_MALLOC_F_LEN) + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE
+#error "SYS_MALLOC_F_LEN too large to fit into initial RAM."
 #endif
 
 	/* r3 = new stack pointer / pre-reloc malloc area */
-	subi    r3, r3, CONFIG_SYS_MALLOC_F_LEN
+	subi    r3, r3, CONFIG_VAL(SYS_MALLOC_F_LEN)
 
 	/* Set pointer to pre-reloc malloc area in GD */
 	stw     r3, GD_MALLOC_BASE(r4)

arch/powerpc/cpu/mpc85xx/start.S

@@ -1183,14 +1183,13 @@ _start_cont:
 	lis	r3,(CONFIG_SYS_INIT_RAM_ADDR)@h
 	ori	r3,r3,((CONFIG_SYS_INIT_SP_OFFSET-16)&~0xf)@l /* Align to 16 */
 
-#ifdef CONFIG_SYS_MALLOC_F_LEN
-
-#if CONFIG_SYS_MALLOC_F_LEN + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE
-#error "CONFIG_SYS_MALLOC_F_LEN too large to fit into initial RAM."
+#if CONFIG_VAL(SYS_MALLOC_F_LEN)
+#if CONFIG_VAL(SYS_MALLOC_F_LEN) + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE
+#error "SYS_MALLOC_F_LEN too large to fit into initial RAM."
 #endif
 
 	/* Leave 16+ byte for back chain termination and NULL return address */
-	subi	r3,r3,((CONFIG_SYS_MALLOC_F_LEN+16+15)&~0xf)
+	subi	r3,r3,((CONFIG_VAL(SYS_MALLOC_F_LEN)+16+15)&~0xf)
 #endif
 
 	/* End of RAM */
@@ -1204,7 +1203,7 @@ _start_cont:
 	cmplw 	r4,r3
 	bne	1b
 
-#ifdef CONFIG_SYS_MALLOC_F_LEN
+#if CONFIG_VAL(SYS_MALLOC_F_LEN)
 	lis	r4,(CONFIG_SYS_INIT_RAM_ADDR)@h
 	ori	r4,r4,(CONFIG_SYS_GBL_DATA_OFFSET)@l