Revert "Revert "Arm backend: Add real implementation for TOSA dialect…

… ops (re…"

This reverts commit 5909e23.

Arm backend: fix Torch compatibility

- Recent pin update to Torch 2.12 no longer exposes .out overloads for
  quantized-decomposed operator.
- Code for backward-compatiliby is included, but should be removed in
  the future when older Torch versions are no longer supported.

Signed-off-by: Sangwon Ha <sangwon.ha@arm.com>
Change-Id: I9b8c76cbfdba36b0b17a772a66a785fdc920f347

Merge branch 'main' into export-D107331163

Merge branch 'main' into vgf_database

Merge branch 'main' into change-1265162

lint

fbcode/executorch/backends/arm/TARGETS

Reviewed By: Ben0mega

Differential Revision: D109822520

fbcode/executorch/backends/arm/quantizer/TARGETS

Reviewed By: Ben0mega

Differential Revision: D110159255

fbcode/executorch/backends/arm/operators/TARGETS

Reviewed By: Ben0mega

Differential Revision: D110158280

fbcode/executorch/backends/arm/tosa/dialect/BUCK

Reviewed By: Ben0mega

Differential Revision: D110162000