Add optional BMA456 accelerometer init on shared I2C bus.

Probe and configure the sensor when present; log and continue boot if
init fails so boards without BMA456 still run normally.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/bma456/bma456w_examples/accelerometer_hw_int/Makefile

@@ -0,0 +1,20 @@
+COINES_INSTALL_PATH ?= ../../../..
+
+EXAMPLE_FILE ?= accelerometer_hw_int.c
+
+API_LOCATION ?= ../..
+
+COMMON_LOCATION ?= ..
+
+C_SRCS += \
+$(API_LOCATION)/bma4.c \
+$(API_LOCATION)/bma456w.c \
+$(COMMON_LOCATION)/common/common.c
+
+INCLUDEPATHS += \
+$(API_LOCATION) \
+$(COMMON_LOCATION)/common
+
+TARGET = MCU_APP30
+
+include $(COINES_INSTALL_PATH)/coines.mk