hdmi: Fix the clean path in Makefile

The clean path isn't clearing the *.o *.cmd *.cmd.o and some more file
types. This patch fixes this and removes all build artifacts cleanly.

Signed-off-by: Vishal Sagar <vishal.sagar@xilinx.com>

Makefile

@@ -10,8 +10,9 @@ modules_install:
 	$(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install
 
 clean:
-	rm -f *.o *~ core .depend .*.cmd *.ko *.mod.c
-	rm -f Module.markers Module.symvers modules.order modules.builtin
-	rm -f */*.ko */*.mod.c */.*.mod.c */.*.cmd */*.o
-	rm -f */modules.order */modules.builtin
-	rm -rf .tmp_versions Modules.symvers
+	find . -name "*.ko" -type f -delete
+	find . -name "*.o" -type f -delete
+	find . -name "*.order" -type f -delete
+	find . -name "*.cmd" -type f -delete
+	find . -name "*.mod*" -type f -delete
+	rm -f Module.symvers