ARM: bcm: Rename board_bcm

In order to support multiple SoC models in the mach-bcm
directory, board_bcm.c is being renamed board_bcm281xx.c
Reviewed-by: NMarkus Mayer <markus.mayer@linaro.org>
Signed-off-by: NChristian Daudt <csd@broadcom.com>

arch/arm/mach-bcm/Makefile

@@ -10,6 +10,6 @@
 # of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 
-obj-$(CONFIG_ARCH_BCM)	:= board_bcm.o bcm_kona_smc.o bcm_kona_smc_asm.o kona.o
+obj-$(CONFIG_ARCH_BCM)		:= board_bcm281xx.o bcm_kona_smc.o bcm_kona_smc_asm.o kona.o
 plus_sec := $(call as-instr,.arch_extension sec,+sec)
 AFLAGS_bcm_kona_smc_asm.o	:=-Wa,-march=armv7-a$(plus_sec)