cmake: changes required for qurt build

Fixed CMakeLists.txt to be consistent with module.mk
Converted PX4_TICKS_PER_SEC to define for QURT to get around relocation error
Added stubs for QURT so building a full executable can be tested. This will
enable CI testing without the full Hexagon SDK.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/modules/uORB/CMakeLists.txt

@@ -63,6 +63,11 @@ elseif(${OS} STREQUAL "posix-arm")
 		uORBManager_posix.cpp
 		uORBTest_UnitTest.cpp
 		)
+elseif(${OS} STREQUAL "qurt")
+	list(APPEND SRCS
+		uORBDevices_posix.cpp
+		uORBManager_posix.cpp
+		)
 endif()
 
 px4_add_module(