only set hw_debounce_time when hw_debounce is active

[ms2-fixes] / Makefile

KDIR=../out/target/product/generic/obj/PARTITIONS/kernel_intermediates/build
ARCH=arm
CROSS_COMPILE=arm-eabi-
CROSS_PATH=$(PWD)/../prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin

obj-m := debounce.o

all:
        PATH=$(CROSS_PATH):$(PATH) CROSS_COMPILE=$(CROSS_COMPILE) ARCH=$(ARCH) $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) V=1 modules

clean:
        PATH=$(CROSS_PATH):$(PATH) CROSS_COMPILE=$(CROSS_COMPILE) ARCH=$(ARCH) $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) clean