Cleanup the Glow CMake file

[nadavrot]

The main Glow CMake file is long and has a bunch of commands and definitions. We should move most of the definitions to submodule cmake files that we include. For example:

This is good:

include(GlowDefaults)

This should move into a CMake include file.

102 # Find habanalabs libraries. 103 list(APPEND CMAKE_PREFIX_PATH /usr/lib/habanalabs) 104 find_path(SYNAPSE_INCLUDE_DIR synapse.h) 105 find_library(SYNAPSE_LIB Synapse) 106 find_library(TPCSIM_SHARED_LIB tpcsim_shared) 107 find_library(HL_THUNK_LIB hl-thunk)

[psyhtest]

It appears that a third-party won't be able to build the Habana backend since the paths are hardcoded ( /usr/lib/habanalabs)?

[psyhtest]

cc: @bertmaher