at91bootstrap: bump version to 2.13

At the same time, remove the unused AT91BOOTSTRAP_PATCH_LEVEL and
AT91BOOTSTRAP_PATCHED_VERSION variables.

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

boot/at91bootstrap/at91bootstrap.mk

@@ -3,9 +3,7 @@
 # at91bootstrap
 #
 #############################################################
-AT91BOOTSTRAP_VERSION:=2.10
-AT91BOOTSTRAP_PATCH_LEVEL:=
-AT91BOOTSTRAP_PATCHED_VERSION:=$(AT91BOOTSTRAP_VERSION)$(AT91BOOTSTRAP_PATCH_LEVEL)
+AT91BOOTSTRAP_VERSION:=2.13
 AT91BOOTSTRAP_NAME:=at91bootstrap-$(AT91BOOTSTRAP_VERSION)
 ATMEL_MIRROR:=$(call qstrip,$(BR2_ATMEL_MIRROR))
 AT91BOOTSTRAP_SITE:=$(ATMEL_MIRROR)
@@ -18,7 +16,7 @@ AT91BOOTSTRAP_BOARD:=$(call qstrip,$(BR2_TARGET_AT91BOOTSTRAP_BOARD))
 
 AT91BOOTSTRAP_MEMORY:=$(call qstrip,$(BR2_TARGET_AT91BOOTSTRAP_MEMORY))
 
-AT91BOOTSTRAP_BINARY:=$(BOARD_NAME)-$(AT91BOOTSTRAP_MEMORY)boot-$(AT91BOOTSTRAP_PATCHED_VERSION).bin
+AT91BOOTSTRAP_BINARY:=$(BOARD_NAME)-$(AT91BOOTSTRAP_MEMORY)boot-$(AT91BOOTSTRAP_VERSION).bin
 
 AT91BOOTSTRAP_TARGET:=$(AT91BOOTSTRAP_DIR)/binaries/$(AT91BOOTSTRAP_BINARY)