at91bootstrap: fix AT91BOOTSTRAP_BINARY

Use AT91BOOTSTRAP_BOARD instead of BOARD_NAME. Remove
AT91BOOTSTRAP_VERSION from the final binary image name.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

boot/at91bootstrap/at91bootstrap.mk

@@ -12,13 +12,9 @@ AT91BOOTSTRAP:=$(call qstrip,$(BR2_AT91BOOTSTRAP))
 AT91BOOTSTRAP_ZCAT:=$(BZCAT)
 
 AT91BOOTSTRAP_BOARD:=$(call qstrip,$(BR2_TARGET_AT91BOOTSTRAP_BOARD))
-
 AT91BOOTSTRAP_MEMORY:=$(call qstrip,$(BR2_TARGET_AT91BOOTSTRAP_MEMORY))
-
-AT91BOOTSTRAP_BINARY:=$(BOARD_NAME)-$(AT91BOOTSTRAP_MEMORY)boot-$(AT91BOOTSTRAP_VERSION).bin
-
+AT91BOOTSTRAP_BINARY:=$(AT91BOOTSTRAP_BOARD)-$(AT91BOOTSTRAP_MEMORY)boot.bin
 AT91BOOTSTRAP_TARGET:=$(AT91BOOTSTRAP_DIR)/binaries/$(AT91BOOTSTRAP_BINARY)
-
 AT91BOOTSTRAP_JUMP_ADDR:=$(call qstrip,$(BR2_AT91BOOTSTRAP_JUMP_ADDR))
 AT91BOOTSTRAP_IMG_SIZE:=$(call qstrip,$(BR2_AT91BOOTSTRAP_IMG_SIZE))