Unify pixis_reset altbank across board families

Basically, refactor the CFG_PIXIS_VBOOT_MASK values
into the separate board config files.

Signed-off-by: Jason Jin <Jason.jin@freescale.com>
Signed-off-by: Jon Loeliger <jdl@freescale.com>

include/configs/MPC8641HPCN.h

diff --git a/include/configs/MPC8641HPCN.h b/include/configs/MPC8641HPCN.h
index aa6dbc4..6f87240 100644
--- a/include/configs/MPC8641HPCN.h
+++ b/include/configs/MPC8641HPCN.h
@@ -201,6 +201,7 @@
 #define PIXIS_VSPEED1		0x18	/* VELA VSpeed 1 */
 #define PIXIS_VCLKH		0x19	/* VELA VCLKH register */
 #define PIXIS_VCLKL		0x1A	/* VELA VCLKL register */
+#define CFG_PIXIS_VBOOT_MASK	0x40    /* Reset altbank mask*/
 
 #define CFG_MAX_FLASH_BANKS	2		/* number of banks */
 #define CFG_MAX_FLASH_SECT	128		/* sectors per device */