Makefile.inc: Remove the CBNT bootblock flag

At the moment this was only used for aligning the bootblock to 64
bytes. At the moment this automatically done with
CONFIG_C_ENV_BOOTBLOCK_SIZE.

Change-Id: I0c879119e525b512eebe3f4c5ff9b2f426c6b6ff
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48468
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Christian Walter <christian.walter@9elements.com>

Makefile.inc

@@ -730,16 +730,6 @@ TXTIBB :=
 
 endif
 
-ifeq ($(CONFIG_INTEL_CBNT_SUPPORT),y)
-
-CBNTIBB := --cbnt
-
-else
-
-CBNTIBB :=
-
-endif # CONFIG_INTEL_CBNT_SUPPORT
-
 ifeq ($(CONFIG_COMPRESS_BOOTBLOCK),y)
 
 $(objcbfs)/bootblock.lz4: $(objcbfs)/bootblock.elf $(objutil)/cbfstool/cbfs-compression-tool
@@ -1085,7 +1075,6 @@ ifeq ($(CONFIG_ARCH_X86),y)
 		-n bootblock \
 		-t bootblock \
 		$(TXTIBB) \
-		$(CBNTIBB) \
 		-b -$(call file-size,$(objcbfs)/bootblock.bin) $(cbfs-autogen-attributes) \
 		$(TS_OPTIONS) \
 		$(CBFSTOOL_ADD_CMD_OPTIONS)