asus/p2b-d[s]: Move to EARLY_CBMEM_INIT

Boot tested on p2b-ds. Migrate p2b-d as well because they share
the same mainboard romstage.

Change-Id: I3e4b98cc6191d557325fc5da97744902996673af
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/21646
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/mainboard/asus/p2b-d/Kconfig

@@ -18,7 +18,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select CPU_INTEL_SLOT_1
 	select NORTHBRIDGE_INTEL_I440BX
-	select LATE_CBMEM_INIT
 	select SOUTHBRIDGE_INTEL_I82371EB
 	select SUPERIO_WINBOND_W83977TF
 	select HAVE_PIRQ_TABLE

src/mainboard/asus/p2b-ds/Kconfig

@@ -18,7 +18,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select CPU_INTEL_SLOT_1
 	select NORTHBRIDGE_INTEL_I440BX
-	select LATE_CBMEM_INIT
 	select SOUTHBRIDGE_INTEL_I82371EB
 	select SUPERIO_WINBOND_W83977TF
 	select HAVE_PIRQ_TABLE

src/mainboard/asus/p2b-ds/romstage.c

@@ -24,6 +24,7 @@
 #include <superio/winbond/common/winbond.h>
 #include <superio/winbond/w83977tf/w83977tf.h>
 #include <lib.h>
+#include <cbmem.h>
 
 #define SERIAL_DEV PNP_DEV(0x3f0, W83977TF_SP1)
 
@@ -40,4 +41,5 @@ void mainboard_romstage_entry(unsigned long bist)
 
 	enable_smbus();
 	sdram_initialize();
+	cbmem_initialize_empty();
 }