allwinner: Move SEPARATE_NOBITS_REGION to platforms

For the existing SoCs we support, we use SEPARATE_NOBITS_REGION, to move
some parts of the data into separate memory regions (to save on the SRAM
A2 we are loaded into).
For the upcoming H616 platform this is of no concern (we run in DRAM),
so make this flag a platform choice instead.

Change-Id: Ic01d49578c6274660f8f112bd23680d3eca3be7a
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

plat/allwinner/common/allwinner-common.mk

@@ -85,9 +85,6 @@ PROGRAMMABLE_RESET_ADDRESS	:=	1
 # Allow mapping read-only data as execute-never.
 SEPARATE_CODE_AND_RODATA	:=	1
 
-# Put NOBITS memory in SRAM A1, overwriting U-Boot's SPL.
-SEPARATE_NOBITS_REGION		:=	1
-
 # BL31 gets loaded alongside BL33 (U-Boot) by U-Boot's SPL
 RESET_TO_BL31			:=	1
 

plat/allwinner/sun50i_a64/platform.mk

@@ -12,3 +12,6 @@ BL31_SOURCES		+=	drivers/allwinner/axp/axp803.c		\
 
 FDT_ASSUME_MASK := "(ASSUME_LATEST | ASSUME_NO_ROLLBACK | ASSUME_LIBFDT_ORDER)"
 $(eval $(call add_define,FDT_ASSUME_MASK))
+
+# Put NOBITS memory in SRAM A1, overwriting U-Boot's SPL.
+SEPARATE_NOBITS_REGION	:=	1

plat/allwinner/sun50i_h6/platform.mk

@@ -9,3 +9,6 @@ include plat/allwinner/common/allwinner-common.mk
 
 BL31_SOURCES		+=	drivers/allwinner/axp/axp805.c		\
 				drivers/allwinner/sunxi_rsb.c
+
+# Put NOBITS memory in SRAM A1, overwriting U-Boot's SPL.
+SEPARATE_NOBITS_REGION	:=	1