[AMX] Update assembler check (#15501)
A recent commit added an assembler check if the ASM dialect was ATT
This unfortunately broke the AMX build for systems that don't have the
ASM-ATT dialect.
This change assumes if the CMAKE_ASM-ATT_COMPILER_ID is not found and
the CMAKE_ASM_COMPILER_ID is "GNU" based on all the other already passed
checks AMX is supported by the compiler and assembler.
### Description
### Motivation and Context
On my build system the recent change to add the ASM-ATT version check
disabled AMX code from the build.
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Signed-off-by: George Nash <george.nash@intel.com>
