platform: refactor: deduplicate code for APL&CNL

First step of deduplicating platforms code.
Keeps binaries identical with just removing duplicated code.

It is critical for maintainability of platform-specific sources (and adding new
platforms in the future).

Signed-off-by: Janusz Jankowski <janusz.jankowski@linux.intel.com>

Author: jajanusz

configure.ac

@@ -487,6 +487,7 @@ AC_CONFIG_FILES([
 	src/platform/cannonlake/include/arch/xtensa/config/Makefile
 	src/platform/cannonlake/include/platform/Makefile
 	src/platform/intel/Makefile
+	src/platform/intel/cavs/Makefile
 	src/platform/intel/include/Makefile
 	src/platform/intel/include/platform/Makefile
 	src/platform/intel/include/platform/cavs/Makefile

src/platform/apollolake/Makefile.am

@@ -7,14 +7,14 @@ EXTRA_DIST = \
 noinst_LIBRARIES = libplatform.a
 
 libplatform_a_SOURCES = \
-	platform.c \
-	dai.c \
-	dma.c \
-	clk.c \
-	timer.c \
-	interrupt.c \
-	memory.c \
-	pm_runtime.c \
+	../intel/cavs/platform.c \
+	../intel/cavs/dai.c \
+	../intel/cavs/dma.c \
+	../intel/cavs/clk.c \
+	../intel/cavs/timer.c \
+	../intel/cavs/interrupt.c \
+	../intel/cavs/memory.c \
+	../intel/cavs/pm_runtime.c \
 	power_down.S
 
 libplatform_a_CFLAGS = \