bcm63xx: image: remove unused definition

KERNEL_ENTRY isn't used by lzma-loader.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bcm63xx/image/Makefile

@@ -16,9 +16,8 @@ LZMA_TEXT_START = 0x81800000		# 32MB - 8MB
 LOADER_MAKEOPTS= \
 		KDIR=$(KDIR) \
 		LOADADDR=$(KERNEL_LOADADDR) \
-		KERNEL_ENTRY=$(KERNEL_LOADADDR) \
 		RAMSIZE=$(RAMSIZE) \
-		LZMA_TEXT_START=$(LZMA_TEXT_START) \
+		LZMA_TEXT_START=$(LZMA_TEXT_START)
 
 RELOCATE_MAKEOPTS= \
 		CACHELINE_SIZE=16 \