Changed the compiler used to build loadable modules to clang. It has been
used for a long time to build sof. The latest xtensa toolchain no longer
has xcc compiler.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

As rimage was moved to sof repository it is necessary to update path to
rimage include directory in lmdk build system.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

This commit adds a necessary symbols in the linker script which allows use
a memory allocation functions from libc (malloc, calloc, etc.) in loadable
modules.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

Changed linker options to enable linking with libgcc and libc. This change
is required to allow use compiler builtins functions (like __divdi3) and
dynamic memory allocation functions.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

Loadable libraries do not need to have a .bss section. After this change,
its absence will be ignored when generating a image of the loadable module.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

The .data and .rodata sections are placed by rimage into one segment of
a resulting firmware image. So aligning the .rodata section to the page
boundary is just a waste of memory.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

The .module section contains the module manifest read by rimage. It should
not be included in the final loadable module image. Flags of this section
are now modified using objcopy to ignore it by rimage.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

At the beginning of the .text section there must be a structure containing
information about the version of the api used by the library. It's absence
will cause sof to interpret a random literal as a version and incorrectly
load a library.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>